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(´°Á´¿ô) ... 2^(n-1) * (2^n - 1) ---> 2^(n-1) * 3 * 5 * (2^n - 1) 2 ¤Î²ò¤Ë´Ø¤¹¤ë¡Ö...¡×¤Ï¡¢ËÜÅö¤Ï·×»»¤¬Â³¤¯¤³¤È¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹¡£ ¤³¤Î·×»»¤Ï¡¢Ê¬Ê줬 1 ¤Ê¤Î¤Ç¡¢¼Â¤Ï¡¢¼ÂºÝ¤Ë¹Ô¤¦¤Î¤ÏÆñ¤·¤¯¤Ê¤ê¤Þ¤¹¡£ ÁÇ°ø¿ô¤È¤Ê¤ë¤Ù¤ÁÇ¿ô¤¬Ìóʬ¤µ¤ì¤Æ¤·¤Þ¤Ã¤Æ¤¤¤ë¤Î¤Ç¡¢¤½¤ì¤òŬÅö¤ËÊ䤦¤·¤«¤¢¤ê¤Þ¤»¤ó¡£ Î㤨¤Ð¡¢2 ¤Ç 2^1 ¤È²¾Äꤹ¤ë¤È¡¢ 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3 : 1 + 3 = 4, 4/3 8/3 * 3/4 = 2 = 4/2 2 : 1 + 2 = 3, 3/2 4/2 * 2/3 = 4/3 ---> NG ºÇ¸å¤Îʬ¿ô¤Î·×»»¤¬ 4/3 ¤Ë¤Ê¤ê¡¢´û¤Ë 3^1 ¤È²¾Äꤷ¤¿ÁÇ°ø¿ô 3 ¤¬ºÆ¤Ó¸½¤ì¤Þ¤¹¡£¤³¤ì¤ÏÌ·½â¤Ç¤¹¡£ NG ¤Ï¼ºÇÔ¤·¤¿¤³¤È¤òɽ¤·¤Þ¤¹¡£¤Ê¤ª¡¢¤³¤ì¤Ï¡¢´°Á´¿ô¤Î¾ì¹ç¤Î n = 2¡¢¤¦¤Þ¤¯¤¤¤«¤Ê¤¤¾ì¹ç¡¢¤ËÂбþ¤·¤Æ¤¤¤Þ¤¹¡£ ¼ºÇÔ¤·¤¿¾ì¹ç¡¢¼¡¤ÎÂбþ¤È¤·¤Æ¡¢2^2 ¤È²¾Äꤹ¤ë¡¢2 °Ê³°¤ÎÁÇ¿ô¤ò¹Í¤¨¤ë¡¢¤ÎÆó¤Ä¤ÎÊýË¡¤¬¤¢¤ê¤Þ¤¹¡£ ¸å¼Ô¤Ï¡¢3, 5 ¤Ï´û¤Ë½Ð¤Æ¤¤¤ë¤Î¤Ç¡¢7 ¤¬Âоݤˤʤê¤Þ¤¹¡£¤É¤Á¤é¤¬¤¤¤¤¤«¤ÎȽÃǤϡ¢»ÄÇ°¤Ê¤¬¤é¡¢¤è¤¯Ê¬¤«¤ê¤Þ¤»¤ó¡£ ¼è¤ê´º¤¨¤º¡¢2^2 ¤È¤·¤Æ¤ß¤ë¤È¡¢ 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3 : 1 + 3 = 4, 4/3 8/3 * 3/4 = 2 = 4/2 2^2 : 1 + 2 + 2^2 = 1 + 2 + 4 = 7, 7/2^2 = 7/4 4/2 * 4/7 = 8/7 7 : 1 + 7 = 8, 8/7 8/7 * 7/8 = 1 ---> 2^2 * 3 * 5 * 7 ¤Ç¡¢¤¦¤Þ¤¯¤¤¤¤Þ¤¹¡£¤³¤ì¤Ï¡¢´°Á´¿ô¤Î¾ì¹ç¤Î n = 3 ¤ËÂбþ¤·¤Þ¤¹¡£7 ¤â¤¦¤Þ¤¤¶ñ¹ç¤Ë½Ð¤Æ¤¤Æ¤¤¤Þ¤¹¡£ ƱÍͤΤ³¤È¤ò·«¤êÊÖ¤·¤Æ¡¢´°Á´¿ô·¿¤Î¾¤Î²ò¤òõ¤¹¤³¤È¤Ï²Äǽ¤Ç¤¹¤¬¡¢¤¤ê¤¬¤Ê¤¤¤Î¤Ç¡¢º£¤Ï¤³¤³¤Þ¤Ç¤Ë¤·¤Æ¤ª¤¤Þ¤¹¡£ ¼¡¤Î²ò¤Î²ÄǽÀ¤È¤·¤Æ¤Ï¡¢3 ¤ò 3^1 ¤Ç¤Ï¤Ê¤¯ 3^2 ¤È²¾Äꤹ¤ë¾ì¹ç¤¬¤¢¤ê¤Þ¤¹¡£¤³¤ì¤Ï¡¢ 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3^2 : 1 + 3 + 3^2 = 1 + 3 + 9 = 13, 13/3^2 = 13/9 8/3 * 9/13 = 24/13 13 : 1 + 13 = 14, 14/13 24/13 * 13/14 = 24/14 = 12/7 7 : 1 + 7 = 8, 8/7 12/7 * 7/8 = 12/8 = 3/2 2 : 1 + 2 = 3, 3/2 3/2 * 2/3 = 1 ---> 2 * 3^2 * 5 * 7 * 13 ¤È¤Ê¤Ã¤Æ¡¢2 * 3^2 * 5 * 7 * 13 = 8190 ¤Î²ò¤òÍ¿¤¨¤Þ¤¹¡£¤Ê¤ª¡¢¤³¤Î¸å¤Ç¤¹¤¬¡¢2^2 ¤Ï¹Í¤¨¤Ê¤¯¤Æ OK ¤Ç¤¹¡£¤³¤ì¤Ï¡¢ 2^2 : 1 + 2 + 2^2 = 1 + 2 + 4 = 7, 7/2^2 = 7/4 3/2 * 4/7 = 6/7 < 1 ¤Ê¤Î¤Ç¡¢T(n) >= 1 ¤ËÌ·½â¤¹¤ë¤«¤é¤Ç¤¹¡£¤³¤ì¤Ï¾ï¤Ë¤¤¤¨¤Þ¤¹¡£ ²ò¤¬µá¤Þ¤ë¾ì¹ç¤Ë¤ÏºÇ¸å¤Ïʬ¿ô¤¬ 1 ¤Ë¤Ê¤ê¤Þ¤¹¤¬¡¢¤³¤Î¤È¤¤ÎÁÇ°ø¿ô¤¬ p^k ¤Î¤È¤¡¢p^(k+m), m > 0 ¤ËÂФ·¤Æ¡¢ T(p^k) = (1 + p + ... + p^k)/p^k = 1 + 1/p + ... + (1/p)^k T(p^(k+m)) = (1 + p + ... + p^k + ... + p^(k+m))/p^(k+m) = 1 + 1/p + ... + (1/p)^k + ... + (1/p)^(k+m) ¤Ê¤Î¤Ç¡¢T(p^k) < T(p^(k+m)) ¤Ç¤¹¤¬¡¢ºÇ¸å¤Îʬ¿ô¤Ï N/T(p^k) = 1 ¤È¤Ê¤Ã¤Æ¤¤¤ë¤Î¤Ç¡¢N/T(p^(k+m)) < 1 ¤È¤Ê¤êÌ·½â¤Ç¤¹¡£ ¤Ä¤Þ¤ê¡¢²ò¤¬¸«¤Ä¤«¤Ã¤¿¾ì¹ç¤ÎÁÇ°ø¿ô¤Ë´Ø¤·¤Æ¤Ï¡¢¤½¤ì°Ê¾å¹Í¤¨¤ëɬÍפϤʤ¤¡¢¤È¤¤¤¦¤³¤È¤Ç¤¹¡£ ¤Þ¤¿¡¢°ìÅÙ¡¢1 ¤è¤ê¾®¤µ¤¯¤Ê¤ì¤Ð¡¢¤½¤ì¤è¤ê¤âÂ礤ʥ٥¤Ë´Ø¤·¤Æ¤Ï¡¢ÅöÁ³ 1 ¤è¤ê¾®¤µ¤¯¤Ê¤ë¤Î¤Ç¡¢¹Í¤¨¤ëɬÍפϤ¢¤ê¤Þ¤»¤ó¡£ Ää»ß¤¹¤ë¾ì¹ç¤Ë´Ø¤·¤Æ¡¢¤³¤³¤Þ¤Ç¤Çʬ¤«¤Ã¤Æ¤¤¤ë¾ì¹ç¤ò¤Þ¤È¤á¤Æ¤ª¤¯¤È¡¢ ¡¦²ò¤¬¸«¤Ä¤«¤Ã¤¿¾ì¹ç¡£ ¡¦´û¤Ë²¾Äꤷ¤¿ÁÇ°ø¿ô¤¬ºÆ¤ÓʬÊì¤Ë¸½¤ì¤¿¾ì¹ç¡£¤³¤ì¤Ï¡¢¼ºÇԤǤ¹¡£ ¡¦»Ä¤ê¤Îʬ¿ô¤¬ 1 ¤è¤ê¾®¤Ë¤Ê¤Ã¤¿¾ì¹ç¡£¤³¤ì¤â¡¢¼ºÇԤǤ¹¡£ °Ê¾å¤ò¹Íθ¤·¤Æ¡¢Àè¤Û¤É¤Î³¤¤ò¹Ô¤Ã¤Æ¡¢Â¾¤Î²ò¤òõ¤·¤Æ¤ß¤Þ¤¹¡£ 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3^2 : 1 + 3 + 3^2 = 1 + 3 + 9 = 13, 13/3^2 = 13/9 8/3 * 9/13 = 24/13 13 : 1 + 13 = 14, 14/13 24/13 * 13/14 = 24/14 = 12/7 7^2 : 1 + 7 + 7^2 = 1 + 7 + 49 = 57 = 3 * 19, (3 * 19)/7^2 12/7 * 7^2/(3 * 19) = (4 * 7)/19 19 : 1 + 19 = 20 = 2^2 * 5, (2^2 * 5)/19 (4 * 7)/19 * 19/(2^2 * 5) = 7/5¡¡<----- 5 ¤¬½Ð¸½ ---> NG 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3^2 : 1 + 3 + 3^2 = 1 + 3 + 9 = 13, 13/3^2 = 13/9 8/3 * 9/13 = 24/13 13 : 1 + 13 = 14, 14/13 24/13 * 13/14 = 24/14 = 12/7 7^2 : 1 + 7 + 7^2 = 1 + 7 + 49 = 57 = 3 * 19, (3 * 19)/7^2 12/7 * 7^2/(3 * 19) = (4 * 7)/19 19^2 : 1 + 19 + 19^2 = 1 + 19 + 361 = 381 = 3 * 127, (3 * 127)/19^2 (4 * 7)/19 * 19^2/(3 * 127) = (4 * 7 * 19)/(3 * 127)¡¡<----- 3 ¤¬½Ð¸½ ---> NG 16/5 5 : 1 + 5 = 6, 6/5 16/5 * 5/6 = 8/3 3^2 : 1 + 3 + 3^2 = 1 + 3 + 9 = 13, 13/3^2 = 13/9 8/3 * 9/13 = 24/13 13 : 1 + 13 = 14, 14/13 24/13 * 13/14 = 24/14 = 12/7 7^2 : 1 + 7 + 7^2 = 1 + 7 + 49 = 57 = 3 * 19, (3 * 19)/7^2 12/7 * 7^2/(3 * 19) = (4 * 7)/19 19^3 : 1 + 19 + 19^2 + 19^3 = 1 + 19 + 361 + 6859 = 7240 = 2^3 * 5 * 181, (2^3 * 5 * 181)/19^3 (4 * 7)/19 * 19^3/(2^3 * 5 * 181) = (7 * 19^2)/(2 * 5 * 181)¡¡<----- 5 ¤¬½Ð¸½ ---> NG ... ¤È¡¢NG ¤¬Â³¤¤Þ¤¹¤¬¡¢19^k ¤Î·ÏÎ󤬽ª¤ï¤ê¤½¤¦¤Ë¤¢¤ê¤Þ¤»¤ó¡£¤³¤ì¤¬¡¢Ää»ßÀ¤ËÉ԰¤¬¤¢¤ë¤È¤¤¤Ã¤¿Íýͳ¤Ç¤¹¡£ ¤Ê¤ª¡¢¤â¤·¡¢5 ¤Î°ø¿ô¤ò 5^2 ¤Ë¤·¤¿¤é¡¢¤ä¤Ï¤êÅÓÃ椬ÌäÂê¤Ç¤¹¤¬¡¢¾¯¤Ê¤¯¤È¤â¡¢ 16/5 5^2 : 1 + 5 + 5^2 = 1 + 5 + 25 = 31, 31/5^2 16/5 * 5^2/31 = (16 * 5)/31 31 : 1 + 31 = 32 = 2^5, 2^5/31 (16 * 5)/31 * 31/2^5 = 5/2 2 : 1 + 2 = 3, 3/2 5/2 * 2/3 = 5/3 3 : 1 + 3 = 4 = 2^2, 2^2/3 5/3 * 3/2^2 = 5/2^2 ---> NG ... 16/5 5^2 : 1 + 5 + 5^2 = 1 + 5 + 25 = 31, 31/5^2 16/5 * 5^2/31 = (16 * 5)/31 31 : 1 + 31 = 32 = 2^5, 2^5/31 (16 * 5)/31 * 31/2^5 = 5/2 2^2 : 1 + 2 + 2^2 = 1 + 2 + 4 = 7, 7/2 5/2 * 2/7 = 5/7 7 : 1 + 7 = 8 = 2^3, 2^3/7 5/7 * 7/2^3 = 5/2^3 ---> NG ... 16/5 5^2 : 1 + 5 + 5^2 = 1 + 5 + 25 = 31, 31/5^2 16/5 * 5^2/31 = (16 * 5)/31 31 : 1 + 31 = 32 = 2^5, 2^5/31 (16 * 5)/31 * 31/2^5 = 5/2 2^3 : 1 + 2 + 2^2 + 2^3 = 1 + 2 + 4 + 8 = 15 = 3 * 5, (3 * 5)/2^3 5/2 * 2^3/(3 * 5) = 2^2/3 3 : 1 + 3 = 4 = 2^2, 2^2/3 2^2/3 * 3/2^2 = 1 ---> 2^3 * 3 * 5^2 * 31 ... ¤È¤Ê¤ê¤Þ¤¹¤¬¡¢¤Ê¤«¤Ê¤«ÂçÊѤǤ¹¡¥¡¥¡¥2^8 ¤Î¾ì¹ç¤Ë¤¿¤É¤êÃ失¤ë¤«¤É¤¦¤«¡¥¡¥¡¥ ¸¶ÍýŪ¤Ë¤Ï¡¢¤³¤ÎÊýË¡¤Ç¤¤¤¯¤é¤Ç¤â²ò¤òõ¤»¤Þ¤¹¤¬¡¢¹Í¤¨¤Ê¤¯¤Æ¤è¤¤¾ì¹ç¤ò¤µ¤é¤ËÂçÉý¤Ë¹Ê¤ê¹þ¤Þ¤Ê¤¤¤È¡¢¼ÂÍѤˤϤʤé¤Ê¤¤¤è¤¦¤Ç¤¹¡£ |
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