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Search: id:A073723
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| A073723 |
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Mod[Sigma[n],Pi[n]]=1 or Sigma[n]=kPi[n]+1. |
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+0
1
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| 4, 9, 16, 64, 69, 218, 592, 808, 910, 1921, 1957, 2648, 2860, 7609, 13462, 14953, 16838, 20688, 27050, 44471, 80440, 91860, 122351, 131095, 154606, 166121, 171396, 226831, 257467, 318016, 614626, 726560
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A000203(n)=1+k.A000720(n)
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MATHEMATICA
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Do[s=Mod[DivisorSigma[1, n], PrimePi[n]]; If[s==1, Print[n]], {n, 1, 1000000}]
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CROSSREFS
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Cf. A000203, A000720, A072548, A073724.
Adjacent sequences: A073720 A073721 A073722 this_sequence A073724 A073725 A073726
Sequence in context: A059931 A027382 A023110 this_sequence A030075 A038784 A038239
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 05 2002
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