A140197 A137576((k-1)/2) for composite numbers k from A141229.
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
Keywords
Programs
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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 *)
Extensions
More terms from Amiram Eldar, Sep 12 2019