A053239 - OEIS

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A053239

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

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; refs; listen; history; internal format)

	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.` `Sequence in context: A070085 A131776 A010322 * A046569 A046596 A174093` `Adjacent sequences: A053236 A053237 A053238 * A053240 A053241 A053242`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 10, 2000`

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Last modified February 17 11:18 EST 2012. Contains 206011 sequences.