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A140197
A137576((k-1)/2) for composite numbers k from A141229.
0
55, 301, 3631, 6085, 19495, 70645, 147853, 438205, 605695, 669781, 888823, 1694695, 3060301, 3640783, 6692791, 7998895, 9857245, 12912535, 15443365, 17109895, 17690941, 22819693, 28048231, 34936663, 58178245, 75203725, 95263573, 124984543, 127160245, 155267965
OFFSET
1,1
MATHEMATICA
r[n_] := EulerPhi[n]/MultiplicativeOrder[2, n]; d[n_] := DivisorSum[n, r[#] &]; f[n_] := (m = MultiplicativeOrder[2, n])*d[n] - m + 1; f /@ Select[Range[10^5], CompositeQ[#] && Total@(r /@ Divisors[#]) - 1 == 3 &] (* Amiram Eldar, Sep 12 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Jun 15 2008
EXTENSIONS
More terms from Amiram Eldar, Sep 12 2019
STATUS
approved