id:A053231 - OEIS Search Results

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First differences between n for which sigma(n) < sigma(n+1), which are not 2.

+0
8

1, 1, 4, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 4, 1, 1, 4, 1, 1, 4, 4, 1, 3, 4, 4, 1, 1, 1, 3, 1, 1, 4, 1, 1, 1, 1, 4, 1, 3, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 1, 1, 1, 1, 3, 4, 1, 1, 1, 1, 4, 4, 1, 1, 4, 4, 1, 1, 1, 3, 4, 1, 1, 1, 1, 4, 1, 1, 1, 1, 4, 1, 3, 1, 3, 4, 4, 1, 1, 1, 1, 4, 1, 1, 4, 1, 1 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`The expansion of A053230 excluding 2's. a(n) = A053230(A053232(n)).`
	MAPLE	with(numtheory): f := [seq( `if`((sigma(i+1) > sigma(i)), i, print( )), i=1..5000)]; seq( `if`(f[i+1] - f[i] <> 2, f[i+1] - f[i], print( )), i=1..2000);
	CROSSREFS	`Cf. A000203, A053224, A053230, A053232, A053233, A053234, A053235, A053236, A053237.` `Sequence in context: A046564 A046592 A010326 this_sequence A066701 A046563 A046591` `Adjacent sequences: A053228 A053229 A053230 this_sequence A053232 A053233 A053234`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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