新年第一道题，数学大侠帮看一看，谢谢

Question

 

Two consecutive whole numbers, each less than 20, are multiplied and their product is increased by 17. There are exactly two values of the lesser of the two consecutive numbers for which the result is not a prime number. Find both values of the lesser number. ( Math Olympiads)

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• 回复：新年第一道题，数学大侠帮看一看，谢谢 -sji- ♀ (16 bytes) () 01/01/2013 postreply 11:32:19

• 回复：新年第一道题，数学大侠帮看一看，谢谢 -CarriePanda- ♀ (72 bytes) () 01/01/2013 postreply 11:33:08

• 互联网真强大，网上居然也能找到这道题 -ca981- ♂ (1576 bytes) () 01/01/2013 postreply 13:35:09