A347939 Primitive terms of A347936: terms of A347936 that are not multiples of other terms of A347936.

155925, 225225, 259875, 294525, 297675, 363825, 405405, 429975, 496125, 552825, 562275, 571725, 606375, 628425, 694575, 760725, 765765, 921375, 945945, 987525, 1044225, 1167075, 1195425, 1334025, 1412775, 1447875, 1486485, 1507275, 1526175, 1611225, 1640925, 1645875

Offset

1,1

Comments

Since any positive odd multiple of a term of A347936 is also a term of A347936, the sequence A347936 consists of the positive odd multiple of this sequence.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Example

The first 8 terms of this sequence are the same as those of A347936. But A347936(9) = 467775 = 3 * 155925 = 3 * A347936(1) is not a term of this sequence.

Mathematica

abQ[n_] := DivisorSigma[1, n] > 2*n; s[n_] := DivisorSum[n, # &, abQ[#] &]; q[n_] := s[n] > 2*n && AllTrue[Most @ Divisors[n], ! q[#] &]; Select[Range[1, 300000, 2], q]

Crossrefs

Subsequence A005101, A005231, A347936 and A347938.

Cf. A006038, A187795.

Sequence in context: A156118 A171658 A347936 * A177811 A341118 A129242

Adjacent sequences: A347936 A347937 A347938 * A347940 A347941 A347942

Keyword

nonn

Author

Amiram Eldar, Sep 20 2021

Status

approved