id:A129294 - OEIS Search Results

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Number of divisors of n^3 - 1 that are not greater than n.

+0
5

1, 1, 2, 2, 3, 2, 4, 2, 5, 3, 5, 2, 7, 2, 4, 7, 5, 3, 6, 2, 6, 6, 6, 2, 13, 4, 4, 4, 8, 4, 10, 3, 6, 5, 6, 5, 14, 2, 6, 5, 8, 3, 10, 3, 8, 10, 5, 3, 16, 3, 9, 5, 9, 2, 11, 5, 8, 7, 4, 3, 20, 2, 5, 9, 11, 4, 18, 4, 6, 5, 8, 3, 14, 5, 4, 8, 6, 4, 17, 2, 21, 5, 6, 3, 16, 6, 10, 8, 8, 2, 14, 5, 9, 7, 6, 5, 16 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = #{d: d<=n and A068601(n) mod d = 0};` `a(n)>1 for n>2, see A129295 for m such that a(m)=2: a(A129295(n))=2.`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..1000`
	EXAMPLE	`a(100) = #{1,3,7,9,11,13,21,27,33,37,39,63,77,91,99} = 15.`
	CROSSREFS	`Cf. A129292, A129296.` `Sequence in context: A001616 A101296 A077462 this_sequence A117658 A067540 A087050` `Adjacent sequences: A129291 A129292 A129293 this_sequence A129295 A129296 A129297`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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