A319239 Positions of nonzero terms in A316441, the list of coefficients in the expansion of Product_{n > 1} 1/(1 + 1/n^s).

1, 2, 3, 5, 7, 8, 11, 13, 16, 17, 19, 23, 24, 27, 29, 30, 31, 32, 36, 37, 40, 41, 42, 43, 47, 53, 54, 56, 59, 60, 61, 64, 66, 67, 70, 71, 73, 78, 79, 81, 83, 84, 88, 89, 90, 96, 97, 100, 101, 102, 103, 104, 105, 107, 109, 110, 113, 114, 120, 125, 126, 127, 128

Offset

1,2

Links

Table of n, a(n) for n=1..63.

Mathematica

facs[n_]:=If[n<=1, {{}}, Join@@Table[Map[Prepend[#, d]&, Select[facs[n/d], Min@@#>=d&]], {d, Rest[Divisors[n]]}]];
Join@@Position[Table[Sum[(-1)^Length[f], {f, facs[n]}], {n, 100}], _Integer?(Abs[#]>0&)]

Crossrefs

Complement of A319240.

Cf. A001055, A045778, A114592, A162247, A190938, A281116, A281118, A303386, A316441, A319237.

Sequence in context: A014121 A287893 A051600 * A331050 A026410 A066720

Adjacent sequences: A319236 A319237 A319238 * A319240 A319241 A319242

Keyword

nonn

Author

Gus Wiseman, Sep 15 2018

Status

approved