id:A057637 - OEIS Search Results

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a(n) is the largest number such that sigma(a(n))=n, where sigma is the sum of divisors function (A000203).

+0
7

1, 0, 2, 3, 0, 5, 4, 7, 0, 0, 0, 11, 9, 13, 8, 0, 0, 17, 0, 19, 0, 0, 0, 23, 0, 0, 0, 12, 0, 29, 25, 31, 0, 0, 0, 22, 0, 37, 18, 27, 0, 41, 0, 43, 0, 0, 0, 47, 0, 0, 0, 0, 0, 53, 0, 39, 49, 0, 0, 59, 0, 61, 32, 0, 0, 0, 0, 67, 0, 0, 0, 71, 0, 73, 0, 0, 0, 45, 0, 79, 0, 0, 0, 83, 0, 0, 0, 0, 0, 89 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`x=11 is the largest x such that sigma(x)=12, so a(12)=11.`
	CROSSREFS	`Cf. A000203, A051444, A054973.` `Sequence in context: A066913 A090303 A051444 this_sequence A167485 A140508 A063956` `Adjacent sequences: A057634 A057635 A057636 this_sequence A057638 A057639 A057640`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (j.mccranie(AT)comcast.net), Oct 10 2000`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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