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A098991
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Numbers n where A098035(n)=0.
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1
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5, 9, 13, 15, 21, 27, 33, 35, 37, 39, 50, 55, 57, 61, 65, 73, 91, 93, 95, 111, 114, 115, 121, 122, 133, 141, 143, 145, 147, 155, 157, 170, 177, 183, 185, 189, 193, 195, 201, 205, 209, 213, 215, 217, 219, 231, 235, 247, 253, 259, 261, 277, 285, 295, 299, 301, 313
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OFFSET
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1,1
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LINKS
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FORMULA
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Sum_{k|n} mu(k+1), where mu() is Moebius function.
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MATHEMATICA
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f[n_] := Plus @@ MoebiusMu[Divisors[n] + 1]; Select[ Range[319], f[ # ] == 0 &]
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PROG
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(PARI) a(n) = sumdiv(n, k, moebius(k + 1));
for(n=1, 320, if(a(n) == 0, print1(n, ", "))) \\ Indranil Ghosh, Mar 16 2017
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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