id:A065988 - OEIS Search Results

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a(n) = largest prime p < n such that n mod p is a perfect square; a(n) = 0 if no such prime exists.

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0, 0, 2, 3, 2, 5, 3, 7, 5, 5, 7, 11, 3, 13, 11, 5, 13, 17, 5, 19, 17, 13, 19, 23, 7, 17, 23, 19, 7, 29, 11, 31, 29, 17, 31, 7, 11, 37, 23, 31, 37, 41, 17, 43, 41, 37, 43, 47, 7, 41, 47, 43, 37, 53, 23, 47, 53, 29, 43, 59, 19, 61, 59, 11, 61, 41, 29, 67, 53, 61, 67, 71, 37, 73, 71 (list; graph; listen)

	OFFSET	`1,3`
	CROSSREFS	`Sequence in context: A073890 A079311 A060474 this_sequence A075105 A094020 A011153` `Adjacent sequences: A065985 A065986 A065987 this_sequence A065989 A065990 A065991`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Dec 10 2001`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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