id:A065916 - OEIS Search Results

Search: id:A065916

Displaying 1-1 of 1 results found.

page 1

Denominator[DivisorSigma[1,8*n^2]/DivisorSigma[1,4*n^2]].

+0
1

7, 31, 7, 127, 7, 31, 7, 511, 7, 31, 7, 127, 7, 31, 7, 2047, 7, 31, 7, 127, 7, 31, 7, 511, 7, 31, 7, 127, 7, 31, 7, 8191, 7, 31, 7, 127, 7, 31, 7, 511, 7, 31, 7, 127, 7, 31, 7, 2047, 7, 31, 7, 127, 7, 31, 7, 511, 7, 31, 7, 127, 7, 31, 7, 32767, 7, 31, 7, 127, 7, 31, 7, 511, 7 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The sequence is not periodic. The denominators are always of the form -1+2^s.`
	LINKS	`R. Stephan, Some divide-and-conquer sequences ...` `R. Stephan, Table of generating functions`
	EXAMPLE	`sigma[72]/sigma[36] = 15/7.`
	PROGRAM	`(PARI) { for (n=1, 1000, a=denominator(sigma(8n^2)/sigma(4n^2)); write("b065916.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 04 2009]`
	CROSSREFS	`Cf. A000203, A028982, A065915` `Sequence in context: A024311 A026653 A156347 this_sequence A122654 A167768 A103630` `Adjacent sequences: A065913 A065914 A065915 this_sequence A065917 A065918 A065919`
	KEYWORD	`nonn,new`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 28 2001`

page 1

Search completed in 0.002 seconds

Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

AT&T Labs Research