id:A129292 - OEIS Search Results

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Number of divisors of n^4 - 1 that are not greater than n.

+0
5

1, 1, 2, 2, 4, 2, 6, 4, 5, 3, 8, 3, 10, 4, 6, 4, 12, 4, 13, 4, 11, 6, 14, 3, 10, 6, 12, 6, 17, 3, 16, 7, 10, 9, 13, 4, 18, 7, 11, 4, 22, 3, 26, 8, 9, 7, 23, 5, 18, 7, 13, 6, 25, 4, 24, 8, 21, 6, 18, 3, 18, 10, 12, 14, 16, 4, 26, 8, 17, 7, 31, 5, 30, 6, 11, 13, 26, 7, 25, 6, 16, 10, 35, 4, 18, 11 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = #{d: d<=n and A123865(n) mod d = 0};` `a(n)>1 for n>2, see A129293 for m such that a(m)=2: a(A129293(n))=2.`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..1000`
	EXAMPLE	`a(100) = #{1,3,9,11,33,73,99} = 7.`
	CROSSREFS	`Cf. A129294, A129296.` `Sequence in context: A091279 A096002 A082175 this_sequence A126606 A077651 A004085` `Adjacent sequences: A129289 A129290 A129291 this_sequence A129293 A129294 A129295`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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