id:A054002 - OEIS Search Results

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Number of divisors of n such that n and n-1 have the same sum of divisors.

+0
3

4, 6, 4, 8, 16, 8, 8, 12, 12, 8, 4, 10, 8, 4, 8, 12, 8, 16, 16, 16, 16, 8, 16, 12, 16, 16, 8, 8, 4, 16, 8, 24, 16, 4, 16, 8, 4, 32, 8, 16, 16, 16, 8, 8, 8, 8, 16, 32, 8, 8, 16, 16, 16, 12, 16, 16, 12, 8, 48, 32, 8, 24, 24, 16, 16, 16, 8, 16, 24, 64, 8, 16, 16, 16, 16, 64, 24, 32, 60 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = tau(A002961(n) + 1)`
	CROSSREFS	`Cf. A000005, A000203, A002961, A053249, A054003.` `Sequence in context: A018835 A055166 A130762 this_sequence A010300 A113209 A088739` `Adjacent sequences: A053999 A054000 A054001 this_sequence A054003 A054004 A054005`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 12, 2000`
	EXTENSIONS	`More terms from Naohiro Nomoto (6284968128(AT)geocities.co.jp), Jun 23 2001`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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