id:A067573 - OEIS Search Results

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Numbers such that Sigma(Phi(k))/Sigma(k) > Sigma(Phi(j))/Sigma(j) for all k > j.

+0
2

2, 3, 5, 7, 13, 31, 37, 61, 181, 241, 421, 1009, 1201, 1321, 1801, 2161, 2521, 7561, 12601, 15121, 30241, 55441, 110881, 278263, 332641, 555911, 666917, 722473, 1443853, 2165407, 3607403, 4324321, 7212581, 8654539, 10817761, 21631147 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`a = 0; Do[b = DivisorSigma[1, EulerPhi[n]]/DivisorSigma[1, n]; If[b > a, a = b; Print[n]], {n, 2, 10^7}]`
	CROSSREFS	`Adjacent sequences: A067570 A067571 A067572 this_sequence A067574 A067575 A067576` `Sequence in context: A063792 A103600 A071905 this_sequence A103199 A054217 A048414`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 30 2002`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

AT&T Labs Research