id:A053230 - OEIS Search Results

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First differences between n for which sigma(n) < sigma(n+1).

+0
10

1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`It seems that the expansion consists of only {1,2,3,4}.`
	FORMULA	`a(n) = A053224(n+1) - A053224(n).`
	MAPLE	with(numtheory): f := [seq( `if`((sigma(i+1) > sigma(i)), i, print( )), i=1..5000)]; `seq( f[i+1] - f[i], i=1..2000);`
	CROSSREFS	`Cf. A000203, A053224, A053231, A053232, A053233, A053234, A053235, A053236, A053237, A053238.` `Adjacent sequences: A053227 A053228 A053229 this_sequence A053231 A053232 A053233` `Sequence in context: A037203 A032556 A110592 this_sequence A048766 A105516 A105518`
	KEYWORD	`nonn,nice`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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