maths~!
回答 (2)
2008-07-10 9:06 pm
✔ 最佳答案
n^2 - 29p = 1 n^2 - 1 = 29p
( n + 1 )( n - 1 ) = 29p
代入n = 30,
( 30 + 1 )( 30 - 1 ) = 29p
29 ( 31 ) = 29p
p = 31 [ 符合p為質數的條件 ]
所以n = 30。
參考: My Maths Knowledge
收錄日期: 2021-04-23 20:34:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080710000051KK01041