id:A053239 - OEIS Search Results

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

+0
8

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

	OFFSET	`1,1`
	FORMULA	`The expansion of A053238 excluding 2's. a(n) = A053238(A053240(n)).`
	MAPLE	with(numtheory): f := [seq( `if`((sigma(i) > sigma(i+1)), 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, A053226, A053238, A053240, A053241, A053242, A053243, A053244, A053245.` `Adjacent sequences: A053236 A053237 A053238 this_sequence A053240 A053241 A053242` `Sequence in context: A070085 A131776 A010322 this_sequence A046569 A046596 A106314`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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