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

Author

Amiram Eldar, Sep 20 2021

Keywords

• nonn

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.

Examples

			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.
		

Links

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

Crossrefs

Subsequence A005101, A005231, A347936 and A347938.

Cf. A006038, A187795.

Programs

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]