id:A129296 - OEIS Search Results

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Number of divisors of n^2 - 1 that are not greater than n.

+0
5

1, 1, 2, 2, 4, 2, 5, 3, 5, 3, 8, 2, 8, 4, 6, 4, 9, 2, 12, 4, 8, 4, 10, 3, 10, 6, 8, 4, 16, 2, 14, 4, 7, 8, 12, 4, 12, 4, 10, 4, 20, 2, 16, 6, 8, 6, 12, 3, 18, 6, 12, 4, 16, 4, 20, 8, 10, 4, 16, 2, 16, 6, 8, 12, 16, 4, 16, 4, 16, 4, 30, 2, 15, 6, 8, 12, 16, 4, 24, 5, 12, 5, 16, 4, 16, 8, 10, 4, 30, 4 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = #{d: d<=n and A005563(n+1) mod d = 0};` `a(n)>1 for n>2, see A129297 for m such that a(m)=2: a(A129297(n))=2.`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10000`
	EXAMPLE	`a(100) = #{1,3,9,11,33,99} = 6.`
	CROSSREFS	`Cf. A129292, A129294.` `Adjacent sequences: A129293 A129294 A129295 this_sequence A129297 A129298 A129299` `Sequence in context: A056148 A057567 A005128 this_sequence A125296 A121895 A139555`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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