id:A053228 - OEIS Search Results

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n for which second differences of sigma(n) are positive.

+0
4

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132 (list; graph; listen)

	OFFSET	`1,1`
	MAPLE	with(numtheory): seq(`if`(sigma(i+2)-sigma(i+1)>(sigma(i+1)-sigma(i)), i, print( )), i=1..142);
	CROSSREFS	`Cf. A000203, A053223, A053229.` `Sequence in context: A122080 A105360 A084564 this_sequence A141098 A084563 A064676` `Adjacent sequences: A053225 A053226 A053227 this_sequence A053229 A053230 A053231`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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