以åæçš¿ããŠããããŒã¿ã䜿ããš
ãã©ãŒã»ã©ãã³æ³ã®Storong pseudoprimeã®çºèŠã«ãããŠ
åºã2,3,6ã®ïŒã€ã§[å
šéšã®åºãæºãã]調æ»ããã°1ïœ10^8ãŸã§ã«ã¯
次ã®21åãçºèŠã§ã
1373653;[829, 1; 1657, 1]=>p*(2*p-1)
1530787;[619, 1; 2473, 1]=>p*(4*p-3)
1987021;[997, 1; 1993, 1]=>p*(2*p-1)
2284453;[1069, 1; 2137, 1]=>p*(2*p-1)
3116107;[883, 1; 3529, 1]=>p*(4*p-3)
5173601;[929, 1; 5569, 1]=>p*(6*p-5)
6787327;[1303, 1; 5209, 1]=>p*(4*p-3)
11541307;[1699, 1; 6793, 1]=>p*(4*p-3)
13694761;[2617, 1; 5233, 1]=>p*(2*p-1)
15978007;[1999, 1; 7993, 1]=>p*(4*p-3)
16070429;[1637, 1; 9817, 1]=>p*(6*p-5)
16879501;[1453, 1; 11617, 1]=>p*(8*p-7)
25326001;[2251, 1; 11251, 1]=>p*(5*p-4)
27509653;[3709, 1; 7417, 1]=>p*(2*p-1)
27664033;[3037, 1; 9109, 1]=>p*(3*p-2)
28527049;[2389, 1; 11941, 1]=>p*(5*p-4)
54029741;[1733, 1; 31177, 1]=>p*(18*p-17)
61832377;[3517, 1; 17581, 1]=>p*(5*p-4)
66096253;[5749, 1; 11497, 1]=>p*(2*p-1)
74927161;[6121, 1; 12241, 1]=>p*(2*p-1)
80375707;[4483, 1; 17929, 1]=>p*(4*p-3)
ã®åã§èµ·ãã£ãŠããæ§ã§ãã
No.1138GAI2023幎5æ27æ¥ 20:27
ãã®ãªã¹ãã¯ã
åºãšããŠã2 ããã³ã« 3 ã ããåã£ããšãã®ãã®ãšåãã«ãªãããã§ããâŠâŠâŠ
ããã¯ãããšã
p*(t*p-t+1)
ã®ããã¡ã«ãªã£ãŠããã®ã§ããã
No.1139Dengan kesaktian Indukmu2023幎5æ27æ¥ 21:00
DD++ããããããã©ãŒã©ãã³ã¯ä»è©±é¡ã«ããŠãã圢ã§ã®åçŽ æ°ã«åŒ±ãã®ããšããããŒããæããããŠããŸãã
å¿
ãããåçŽ æ°ã«ã¯ãªããªãããã§ããã®ã§
以äžã«ã¡ã¢ããããŸãã
3215031751 ã¯ã
2, 3 ããšãã«åºãšãããšãã«
匷æ¬çŽ æ°ã§ãã
ãã®æ°ã¯
28351 * 113401
ã«çããããŸã
113401 = 28351 * 4 -3
ãšãªã£ãŠããŸãã
ç§éãããŸèå³ããã£ãŠãã圢ã§ããã
ããŠã
113401 = 151*751
ãšçŽ å æ°å解å¯èœã§ãã
ãã®ããšãã
3215031751 ã¯åçŽ æ°ã§ã¯ãããŸããã
No.1140Dengan kesaktian Indukmu2023幎5æ28æ¥ 17:33
å人çã«ã¯ãåçŽ æ°ã§ãããã©ããããããk ãš 2k-1 ãšããå€ã®å€§ããã®é¢ä¿ãæ°ã«ããŠããŸããã
ãã®åŸã
ã»ã©ããã k+1 ãš 2k+1 ãšãã圢ã«æžããæ¹ãããããš
ã»2k+1 ã ãã§ãªã mk+1 ãšãã圢ã§ããã° m=2 ãšãã圢ãã©ããã¯ããŸãéèŠã§ãªããããªããš
ãèŠããŠããŠããŸããã
751 ãš 151 ãã
151 = 150 + 1
751 = 5*150 + 1
ã§ããããåæ§ã®æ§è³ªã¯æã£ãŠãããšèšã£ãŠããããã«æããŸãã
No.1141DD++2023幎5æ28æ¥ 18:17
2 ãš 3 ãšããšãã«å«ã
è€æ°ã®åºã§ãã©ãŒã»ã©ãã³å€å®ãè¡ã
çµæã匷æ¬çŽ æ°ã§ãã£ããšããŸãã
ãã®åŒ·æ¬çŽ æ°ãçŽ æ°ã§ããã®ãåææ°ã§ãããã«ã€ããŠãæŽã«èª¿ã¹ãããšæã£ããšããŸãã
ãã®åŒ·æ¬çŽ æ°ã S ãšããŸãã
ãŸã æªèšŒæã§ããã次ã®ãããªäºæ³ãæãç«ã€ãšããŸããããããªãã¡ã
S ãåææ°ã§ãããªãã°
èªç¶æ° k ãš m ãšããã£ãŠ
S = (k +1)*(m*k +1) âŠâŠâŠâ
ãšãªãã
S ãçŽ æ°ã§ãããåææ°ã§ããããç¥ããããšãã« â ãããŠã«ããŠãããšãããªãã°
åã«ãâS ãŸã§ã®çŽ æ°ãåæããŠ
S ããããã§å²ã£ãŠã¿ãçŽ å æ°å解æ¹æ³ãããéãçŽ å æ°å解ã®çµæãåŸãããããšãããã®ã§ããããïŒ
GAI ããã«ãã 10^8 ãŸã§ã®
匷æ¬çŽ æ°ã®çŽ å æ°å解ã®ãªã¹ããèŠãããã
ã©ããã m ã¯ããªãå°ããã§ãã
m ã«ã€ããŠå°ããé ã«èª¿ã¹ããšè¯ãã®ã§ã¯ãšæããŸãã
â ããk ã«ã€ããŠã®ïŒæ¬¡æ¹çšåŒãšã¿ãŠ
å€å¥åŒãå¹³æ¹æ°ã«ãªããã©ããæ€æ»ãããš
ããã®ã§ã¯ãªãããšå±±åãåãããŠã¿ãŸããã
ããŠããã®æ¹æ³ã¯ãæ¬åœã«éãåŠçã§ãããã®ãªã®ã§ããããïŒ
No.1142Dengan kesaktian Indukmu2023幎5æ30æ¥ 09:02
çŽ å æ°å解ã§ãããŸã§ã®ãå¹³åæéãã¯å§åçã«éããšæããŸãã
çŽ å æ°å解ãã§ãããŸã§ã®ãææªã®æéãã¯ãããæªåãããšæããŸããã
ã€ãŸããææªè©Šããªãããããªãåè£ã®æ°ã¯å¢ããŸãããåœããã«ãªãå¯èœæ§ãé«ããšããã ããæåã«ããã¯ã¢ããããŠè©Šããæãã«ãªããŸãã
ãã¶ãã
No.1143DD++2023幎5æ30æ¥ 10:59
DD++ããã
埡æèŠãããããšãããããŸããã
ç§ã®å¿è±¡ãããã«è¿ããã®ããããŸãã
ãããŸã§ã¡ãã£ãšè©±ãé£ã°ãããããããããããŸãã®ã§ã以äžã§ã¯å°ãŸãšãããããšã§ãã°ãèŠè¿ãããšãã«ããããããããã«ã§ãã
2 ããã³ã« 3 ãå«ãè€æ°ã®åºã䜿ã£ãŠãã©ãŒã»ã©ãã³å€å®æ³ãè¡ããŸãããã®çµæãšããŠåææ°ãšããŠå€å®ãããªãã£ããã®ã¯åŒ·æ¬çŽ æ°ã§ãããäŸç¶ãšããŠåææ°ã§ãã確çãããããªããæ®ã£ãŠããŸããä»åã¯ãã®æ°ã S ãšæžãããšã«ããŸãã
芳å¯ã«ããã°ãS ãåææ°ã§ãããªãã°ãm k ãèªç¶æ°ãšããŠã
S = (k +1)*(m*k +1)
ãšãªãããšãæåŸ
ãããŸãã
ãªãã(k +1)ã(m*k +1) ã«ã€ããŠã¯ãçŽ æ°ã§ããããšãèŠè«ããŸããã念ã®ããã
ãããã m k ã簡䟿ã«æ±ããããã°ã
匷æ¬çŽ æ° S ãåææ°ã§ããããšã®å€å®ã簡䟿ã«ã§ããããšãšãªããŸãã m k ãã¿ã€ããããªãã£ããšããŠããããã¯ãåææ°ã§ããããšããã®ææ³ã§ã¯èšŒæã§ããªãã£ãã ãã®ããšãªã®ã§ã匷æ¬çŽ æ° S ãçŽ æ°ã§ãããšã¯éããŸããã
å
·äœäŸããããŸãã
S = 16697267137953148781
ãšããŸãã
ãªãããã® S ã¯ãåºãšããŠã2, 3, 5, 7 ã䜿ã£ããã©ãŒã»ã©ãã³æ³ã§åŒ·æ¬çŽ æ°ãšãªããã®ã§ãã
S = (k +1)*(m*k +1)
ãšãªã m k ãã¿ã€ããããã«
k ã«ã€ããŠã®ïŒæ¬¡æ¹çšåŒãšã¿ããŠãŠããã解ãããšãèããŸããããªãã¡
m*k^2 +(m +1)*k +(1 -S) = 0
D = (m +1)^2 -4*m*(1 -S)
ãšãããšããã®ïŒæ¬¡æ¹çšåŒã®æ£ã®è§£ã¯
k = (-(m +1) +âD)/(2*m)
ãšãªããŸããk ãè² ã®è§£ã¯æšãŠãŸãã
k ãèªç¶æ°ã§ããããã®å¿
èŠæ¡ä»¶ã®ã²ãšã€ã¯
D ãå¹³æ¹æ°ã§ããããšã§ãã
æ¬åœã¯ã(2*m)ã§å²ã£ãŠããŸããããååæ¡ä»¶ã«ã¯ãªã£ãŠããŸããã
ããšã§ç¢ºãããããšã«ããŸããâ
â
â
D = (m +1)^2 -4*m*(1 -S)
ãªã®ã§ãããããããå¹³æ¹æ°ã«ãªããã㪠m ãããŸãèŠã€ãããšãããããããã§ãã
ãããŸã§ã®èŠ³å¯ã«ããã°ãm ã¯ãã»ã©å€§ããªæ°ã«ã¯ãªããªãããã§ãã®ã§ãm ã«ã€ããŠã1 ããã¯ãããŠé 次ã«ãŠã³ãã¢ããããŠæ¢ãããšãšããŸãã
å®éã«ãã£ãŠã¿ããšã(ããã°ã©ã ãçµããªãã®ã§é»åã§ããŸãã)
m = 6 㧠D ãå¹³æ¹æ°ãšãªããŸããã
ãã®ãšãã® D ã¯
D = 400734411310875570769 = 20018351863^2
ã§ããæ©ãã¿ã€ãã£ãŠã©ãããŒããã® m ãããšã®ïŒæ¬¡æ¹çšåŒã«ã»ããããã§ãããš
k = (-7 +âD)/(12)
= (20018351863 -7)/12
ãšãªããŸãã
ã¡ãããš 12 ã§å²ãåããã°ããã®ã§ããâŠâŠåã«â
â
â
ã§çæç¹ãšããŠãããŠããããšãããã§ç¢ºèªãããŸãã
å®éã«èšç®ããŠã¿ããš
k = 1668195988
ãšãªããŸããâ
â
â
ã¯ã¯ãªã¢ãããŸããã
m = 6 ã§ãããã
S ã¯
S = (1668195988 +1)*(6*1668195988 +1)
ãšãªããŸãã
æ€ç®ãããš
確ãã«ã
S = 16697267137953148781
ãšãªããŸãã
S ã¯åææ°ãšå€å®ãããŸããã
以äžã®ããã«ãæ¯èŒçã«ç°¡äŸ¿ã«åææ°å€å®ãã§ããã±ãŒã¹ãå€ãã¿ãããã®ã§ã¯ãªãããšã®äºæ³ãããŠãŠã¿ãŠããŸãã
ãã©ãŒã»ã©ãã³å€å®æ³ã®è£å©æ段ãšããŠå©çšã§ãããå¬ããã§ãã
No.1145Dengan kesaktian Indukmu2023幎5æ30æ¥ 19:18
èšãå¿ããŸããã
16697267137953148781 ã¯ãåºã 6 ãšãããšåææ°ãšå€å®ãããããã§ãã
2 ã§ã 3 ã§ã匷æ¬çŽ æ°ãªã®ã«ã
No.1146Dengan kesaktian Indukmu2023幎5æ30æ¥ 19:21
k ãè² ã®æŽæ°ã®å Žåãçã£ãŠãã圢ãšã¯åèŽããŸããã S ã®å æ°å解ã«ã¯æåããŸãã
ã§ããããæé€ããå¿
èŠã¯ãªãã®ã§ã¯ãªãããšæããŸãã
ãŸããk ãæŽæ°ã«ãªããªãå Žåã®å¿é
ã§ãããä»®ã«ãããªã£ãŠã 4mS ã 2 ã€ã®å æ°ã«ãããããšã¯æåããŸãã
m ã S ãããã£ãšå°ããå Žåã¯ããã®å Žåã§ãïŒç®çã®åŒã®åœ¢ã«ã¯ãªããŸãããïŒS ã®å æ°å解ã«ã¯æåããããããªãããšæãã®ã§ãããã©ããªã®ã§ãããã
No.1147DD++2023幎5æ31æ¥ 00:54
> DD++ãããæžãããŸãã:
> ãŸããk ãæŽæ°ã«ãªããªãå Žåã®å¿é
ã§ãããä»®ã«ãããªã£ãŠã 4mS ã 2 ã€ã®å æ°ã«ãããããšã¯æåããŸãã
> m ã S ãããã£ãšå°ããå Žåã¯ããã®å Žåã§ãïŒç®çã®åŒã®åœ¢ã«ã¯ãªããŸãããïŒS ã®å æ°å解ã«ã¯æåããããããªãããšæãã®ã§ãããã©ããªã®ã§ãããã
ã¢ããã€ã¹ãæé£ãããããŸãã
D = (m +1)^2 -4*m*(1 -S)
ãšããŠããŸãããããããæŽçãããš
D = (m -1)^2 +4*m*S
ãã® D ãããèªç¶æ° T ã®ïŒä¹ã«ãªã£ãŠãããš
éå¹³ãåºæ¥ãŠå¬ããã®ã§ããã
ãããã T ãã¿ã€ãã£ããšãã«ã¯
(m -1)^2 +4*m*S = T^2
ãšãªãããããå€åœ¢ããã°
4*m*S = T^2 -(m -1)^2
4*m*S = (T +(m -1))*(T -(m -1))
ãšãªããŸãã
ä»°ããšããã«ã
ã4mS ã 2 ã€ã®å æ°ã«ãããããšã¯æåããŸããã
ãšããããŸããã
å®çšã®ç¯å²å
㧠m ãååã«å°ããããšããããã°ã
k ãæ±ããããšãè¡ããªããŠã
S ã®åææ°å€å®ãã§ããã®ã§ããã
ãã©ããã§ãã
> DD++ãããæžãããŸãã:
> k ãè² ã®æŽæ°ã®å Žåãçã£ãŠãã圢ãšã¯åèŽããŸããã S ã®å æ°å解ã«ã¯æåããŸãã
> ã§ããããæé€ããå¿
èŠã¯ãªãã®ã§ã¯ãªãããšæããŸãã
â
ãããæå³ãã€ãããŸããã§ããã
ãããããã°ãæ瀺ãè³ããããé¡ãããããŸãã
No.1148Dengan kesaktian Indukmu2023幎6æ1æ¥ 14:39
> 芳å¯ã«ããã°ãS ãåææ°ã§ãããªãã°ãm k ãèªç¶æ°ãšããŠã
S = (k +1)*(m*k +1)
ãšãªãããšãæåŸ
ãããŸãã
åäŸãããããã¿ã€ããŸããã
S = 196161196117261
ã¯ãåºã 2, 3 ãšãããã©ãŒã»ã©ãã³å€å®æ³ã§åŒ·æ¬çŽ æ°ã§ããã
S = 6602377*29710693
ãšããåçŽ æ°ã§ã
k = 6602376
m = 29710692/6602376 = 9/2
ãšãªã£ãŠããŸãã
No.1149Dengan kesaktian Indukmu2023幎6æ1æ¥ 21:27
k ãè² ã®æŽæ°ã ãš
S = (-101)*(-103)
ã¿ãããªåœ¢ã«ãªãã®ã§ãèªç¶æ°ã®ç©ã«ã¯ãªããŸããã
ã§ãããããèŠãŠèªç¶æ°ã®ç©ã«æžãçŽãã®ã¯å®¹æã§ãããããšãã話ã§ãã
> åäŸ
èã
ãããªäºæã¯ããŠããŸãããããã£ã±ã (mk+1)*(nk+1) ã®åœ¢ãåºãŠããŸãããã
ãŸããm ã n ãå°ãããšããæ¡ä»¶ã§ãªãã該åœããæ°ãæ¢ãåŽåã¯ãããªã«å€ãããªããšæããŸããã
No.1150DD++2023幎6æ2æ¥ 00:28
ãã®æ°S以åã«ã¯
190131062354461,190847302523971,191212468762741,
ãã®æ°ä»¥éã
197201702068963,197867738963563,198675496474963,198888784469461,200262009366409,
200271411485473,200669198495977,201324851364883,
ç次ã
ãšèŠã€ãããŸããã
ãã®æ°SåšèŸºãã調æ»ããªãã£ãã®ã§ãã£ãšå°ããæ°ã§ãäŸå€ãèŠã€ãããããªé°å²æ°ã§ããã
No.1153GAI2023幎6æ2æ¥ 07:39
1150 ã® DD++ ããã
ãè¿äºãããããšãããããŸãã
S = (k +1)*(m*k +1) âŠâŠâŠâ
ã§ã¯ãªãã
S = (k -1)*(m*k -1)
ã®è§£ãæ±ããããããšããããšã«ãªãã®ã§ããããªãã»ã©ã
1153 ã®ãGAI ããã
(m*k+1)*(n*k+1)
ã®ããã¡ã§ããããšããŠ
m ã n ã倧ããã®ãã®ã£ãŠãããŸãããã
æåã« GAI ããã«ãæ瀺ããã ãã
10^8 ãŸã§ã®ãªã¹ãã§ã®ãããã¯
m = 18 , n = 1ã§ããã
å®ã¯ããã®åäŸ
S = 6602377*29710693
ã¯ã倧ã㪠m ãã²ãããé»åã§
ããããŠããŠã¿ã€ããã®ã§ãã
m æãããã¡ãã«èå³ããã£ããã®ã§ãããã
No.1155Dengan kesaktian Indukmu2023幎6æ3æ¥ 16:45
ã¡ãã£ãšç¢ºèªãããããšãããã®ã§ã空éå³åœ¢ã«è©³ããæ¹ãåçãé¡ãããŸãã
xyz 空éå
ã«
çŽç· l : y = â3*x, z = 0
å¹³é¢ P : xz å¹³é¢
ããããšããçŽç· l ãšå¹³é¢ P ããªãè§ã¯ã©ãã§ããïŒ
(1) Ï/3 (60°)
(2) Ï/6 (30°)
(3) Ï/3 (60°) ãšå®çŸ©ããå ŽåãããããÏ/6 (30°) ãšå®çŸ©ããå Žåããã
(4) ãããããå¹³é¢ãšçŽç·ã®ãªãè§ãã«äžè¬çã«æµžéããŠããå®çŸ©ãååšããªã
質åã®æå³ãšããŠã¯ãçŽç·ãšå¹³é¢ã®ãªãè§ããšã¯å®çŸ©äžã©ããæãã®ã§ããããããšãã話ã§ãã
---
(12:28) è¿œèš
2 æãããªãæ¹ãããæ°ãããã®ã§éžæè¢ã« (3)(4) ãå¢ãããŸããã
No.1001DD++2023幎4æ30æ¥ 12:02
(1)ã ãšæããŸãã
å¹³é¢ãšåçŽãªçŽç·ããæ³ç·ããšå®çŸ©ãããŠããŸãã®ã§ãæ³ç·ãšå¹³é¢ã®ãªãè§ã¯90°ã§ããã
ããããèãããšlãšPã®ãªãè§ã¯60°ãšèããªããšççŸãçããŠããŸããšæããŸãã
ïŒãã以å€ã®å®çŸ©ã¯èŠãããšããããŸããïŒ
30°ã¯ãå¹³é¢Pã®æ³ç·ãšçŽç·lã®ãªãè§åºŠãã®ããã«èšããšæããŸãã
No.1002ãããã2023幎4æ30æ¥ 16:46
ããããšãããããŸãã
ãã£ã±ã (1) ã§ããã§ãããã
ãšããããå
æ¥ããå Žæã§åºäŒã£ãåé¡ã«ã以äžã®ããã«æžããŠãã£ããã§ãã
ããã ãçŽç·ãå¹³é¢ã«å«ãŸãããšããäž¡è
ã®ãªãè§ã¯ Ï/2 ãšããŸããã
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(505*10^n -1)/9
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No.1086Dengan kesaktian Indukmu2023幎5æ14æ¥ 13:48
以åãã£ã 381111âŠâŠ ã®è©±ããšæã£ãããä»å㯠371111âŠâŠ ãªã®ã§ããã
http://shochandas.xsrv.jp/mathbun/mathbun1315.html
No.1087DD++2023幎5æ14æ¥ 15:39
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No.1089Dengan kesaktian Indukmu2023幎5æ14æ¥ 18:08
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No.1090Dengan kesaktian Indukmu2023幎5æ14æ¥ 18:13
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No.1091ããããã¯ã¡ã¹ã2023幎5æ15æ¥ 07:12
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No.1093ããããã¯ã¡ã¹ã2023幎5æ15æ¥ 14:19
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No.1096GAI2023幎5æ16æ¥ 07:09
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No.1097Dengan kesaktian Indukmu2023幎5æ16æ¥ 10:11
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No.1098ããããã¯ã¡ã¹ã2023幎5æ16æ¥ 11:04
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No.1099DD++2023幎5æ16æ¥ 14:25
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æ£ããã¯æš¡ç¯è§£çã® PDF ã«ãããŸããšããã
If n = 3*k â¡ 0 (mod 3), observe that
9*a*(3*k) = 34299 · · · 99
= (7*10^k)^3 â1
which is properly divisible by 7*10^k â 1,
a number that is larger than 9.
Hence a(3k) admits a non-trivial factor and so is not prime.
ãªã®ã§ãããç§ã¯ãšãã§ããªãèªã¿ééãã
ããŠãããŸãããããªãã¡ã
If n = 3*k â¡ 0 (mod 3), observe that
9*a*(3*k) = 34299 · · · 99
= (7*10^k)^3 â1
which is properly divisible by (7*10^k)^3 â1
,
a number that is larger than 9.
Hence a(3k) admits a non-trivial factor and so is not prime.ã
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No.1100Dengan kesaktian Indukmu2023幎5æ16æ¥ 17:17
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No.1101Dengan kesaktian Indukmu2023幎5æ16æ¥ 23:10
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No.1102ããããã¯ã¡ã¹ã2023幎5æ17æ¥ 07:13
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No.1103ãããã2023幎5æ17æ¥ 13:37
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No.1106ããããã¯ã¡ã¹ã2023幎5æ18æ¥ 08:53 > "ãããã"ãããæžãããŸãã:
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No.1115Dengan kesaktian Indukmu2023幎5æ20æ¥ 18:03
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No.1088ããããã¯ã¡ã¹ã2023幎5æ14æ¥ 17:13
41 ã®ä»ã« 27 ã解ã§ã¯ãªãã§ããããïŒ
27 + (2+7) + (2*7) = 27 + 9 + 14 = 50
No.1077DD++2023幎5æ13æ¥ 10:52
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No.1035DD++2023幎5æ5æ¥ 07:26
næ¬ã®å Žåã«åºãæ¹ãF(n)éããããšããã
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F(n+1) = Σ[i=0...n] Combination(n,i) * F(i) * (i+1) * F(n-i)
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No.1046ããã²ã2023幎5æ6æ¥ 03:29
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Σ[k=0...n] nCk * (k+1)^k * (n-k+1)^(n-k-1) = (n+2)^n
Σ[k=0...n] nCk * (k+1)^(k-1) * (n-k+1)^(n-k-1) = 2*(n+2)^(n-1)
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No.1051DD++2023幎5æ6æ¥ 08:27
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No.1054DD++2023幎5æ6æ¥ 10:31
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https://en.m.wikipedia.org/wiki/Cayley%27s_formula
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https://en.m.wikipedia.org/wiki/Double_counting_(proof_technique)
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ããã§ãæé·æ°åã®ç·æ°ãã解決ããããšã«ãªããŸãã
ãããã¯ãèãæ¹ãæµçšããã°ããŸã¡éã®æšãã®åé¡ã«åž°çããããŸã§ããªããã£ã¡ã解ããããã
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ãããŠæ®ã£ã No.1051 ã®æçåŒã®è¬ã
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No.1056DD++2023幎5æ6æ¥ 11:45
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> ãããŠæ®ã£ã No.1051 ã®æçåŒã®è¬ã
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nCk ã C[n,k] ãšæžãããšã«ããŸãã
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C[n,i] * C[n-i,j] = C[n,j] * C[n-j,i]
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f(k)ãkã®n-1次以äžã®å€é
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Σ[k=0...n] C[n,k] * (-1)^k * f(k) = 0
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Σ[h=0...n] C[n,h] * (h+1)^h * (n-h+1)^(n-h-1)
= Σ[h=0...n] C[n,n-h] * (n-h+1)^(n-h-1) * (h+1)^h
= Σ[k=0...n] C[n,k] * (k+1)^(k-1) * (n-k+1)^(n-k)
= Σ[k=0...n] C[n,k] * (k+1)^(k-1) * ((n+2)-(k+1))^(n-k)
= Σ[k=0...n] C[n,k] * (k+1)^(k-1) * { Σ[m=0...n-k] C[n-k,m] * (n+2)^m * (-1)^(n-k-m) * (k+1)^(n-k-m) }
= Σ[k=0...n] Σ[m=0...n-k] C[n,k] * C[n-k,m] * (n+2)^m * (-1)^(n-k-m) * (k+1)^(n-m-1)
= Σ[m=0...n] Σ[k=0...n-m] C[n,k] * C[n-k,m] * (n+2)^m * (-1)^(n-k-m) * (k+1)^(n-m-1)
= (n+2)^n + Σ[m=0...n-1] Σ[k=0...n-m] C[n,k] * C[n-k,m] * (n+2)^m * (-1)^(n-k-m) * (k+1)^(n-m-1)
= (n+2)^n + Σ[m=0...n-1] Σ[k=0...n-m] C[n,m] * C[n-m,k] * (n+2)^m * (-1)^(n-m) * (-1)^k * (k+1)^(n-m-1)
= (n+2)^n + Σ[m=0...n-1] C[n,m] * (n+2)^m * (-1)^(n-m) * { Σ[k=0...n-m] C[n-m,k] * (-1)^k * (k+1)^(n-m-1) }
= (n+2)^n + Σ[m=0...n-1] C[n,m] * (n+2)^m * (-1)^(n-m) * 0
= (n+2)^n
No.1068ããã²ã2023幎5æ8æ¥ 19:12
ããããªãã»ã©ããããªæ¹æ³ã§ k+1 ã®ææ°ãã k ãæ¶ãããšã¯ã
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> Σ[k=0...n] nCk * (k+1)^k * (n-k+1)^(n-k-1) = (n+2)^n
>
> Σ[k=0...n] nCk * (k+1)^(k-1) * (n-k+1)^(n-k-1) = 2*(n+2)^(n-1)
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äžã®åŒã¯ããã²ãããã®èšŒæã® 1 è¡ç®ïŒ h ããã®ãŸãŸ k ã«æžãæãïŒãš 3 è¡ç®ã足ãããã®ãæçµçµæã® 2 åã«ãªãããšããåŸãããŸãã
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No.1069DD++2023幎5æ9æ¥ 00:44
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(a+b)^n / a = Σ[k=0...n] C[n,k] * (a+k)^(k-1) * (b-k)^(n-k)
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a,bã¯æŽæ°ã«éããå®æ°ã§ãããã®ãé¢çœããšããã§ããã
No.1076ããã²ã2023幎5æ12æ¥ 13:29