id:A053238 - OEIS Search Results

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

+0
10

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

	OFFSET	`1,1`
	COMMENT	`It seems that the expansion consists of only {1,2,3,4}.`
	FORMULA	`a(n) = A053226(n+1) - A053226(n).`
	MAPLE	with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), i, print( )), i=1..5000)]; `seq( f[i+1] - f[i], i=1..2000);`
	CROSSREFS	`Cf. A000203, A053226, A053230, A053239, A053240, A053241, A053242, A053243, A053244, A053245.` `Sequence in context: A132003 A109810 A122066 this_sequence A058263 A048669 A034444` `Adjacent sequences: A053235 A053236 A053237 this_sequence A053239 A053240 A053241`
	KEYWORD	`nonn,nice`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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