id:A088837 - OEIS Search Results

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Numerator of quotient=sigma[2n]/sigma[n]. Denominator see in A038712.

+0
7

3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3, 7, 3, 63, 3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3, 7, 3, 127, 3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3, 7, 3, 63, 3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3, 7, 3, 255, 3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3, 7, 3, 63, 3, 7, 3, 15, 3, 7, 3, 31, 3, 7, 3, 15, 3 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = 42^A007814(n)-1 = 4A006519(n)-1 = A059159(n-1).`
	MATHEMATICA	`k=2; Table[Numerator[DivisorSigma[1, k*n]/DivisorSigma[1, n]], {n, 1, 128}]`
	CROSSREFS	`Cf. A038712, A088838-A088840, A080278.` `2*A038712(n) + 1.` `Sequence in context: A005596 A159566 A096385 this_sequence A019158 A086153 A049479` `Adjacent sequences: A088834 A088835 A088836 this_sequence A088838 A088839 A088840`
	KEYWORD	`easy,nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 04 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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