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A067696 Numbers n such that prime(n)==-1 (mod sigma(n)). 0
1, 5, 13, 15, 31, 39, 49, 96, 111, 205, 215, 452, 492, 712, 1258, 5599, 10170, 11514, 32844, 58841, 59550, 83251, 83650, 115139, 120485, 144835, 152583, 467583, 709178, 1617217, 3101711, 3554345, 3714335, 6580179, 8099488 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..35.

MATHEMATICA

Do[s=(Prime[n]+1)/DivisorSigma[1, n]; If[IntegerQ[s], Print[n]], {n, 1000000, 10000000}

CROSSREFS

Sequence in context: A020996 A090759 A090758 * A050598 A158334 A088908

Adjacent sequences:  A067693 A067694 A067695 * A067697 A067698 A067699

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 05 2002

EXTENSIONS

More terms from Labos E. (labos(AT)ana.sote.hu), Jun 12 2003

STATUS

approved

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Last modified May 23 00:23 EDT 2013. Contains 225585 sequences.