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A347938 Primitive terms of A347935: terms of A347935 that are not multiples of other terms of A347935. 2
60, 72, 108, 168, 252, 264, 280, 312, 396, 400, 468, 588, 612, 684, 816, 828, 880, 912, 924, 1040, 1044, 1092, 1104, 1116, 1232, 1332, 1360, 1392, 1428, 1456, 1476, 1520, 1548, 1568, 1596, 1692, 1716, 1840, 1890, 1908, 1932, 2124, 2196, 2200, 2244, 2288, 2320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Since any positive multiple of a term of A347935 is also a term of A347935, the sequence A347935 consists of the positive multiple of this sequence.

LINKS

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

EXAMPLE

The first 10 terms of A347935 are 60, 72, 108, 120, 144, 168, 180, 216, 240, 252. 120, 180 and 240 are multiples of 60, 144 is a multiple of 72, and 216 is a multiple of 108 and therefore they are not terms of this sequence. So, this sequence begins with 60, 72, 108, 168, 252.

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[3000], q]

CROSSREFS

Subsequence of A005101 and A347935.

Cf. A071395, A091191, A187795.

Sequence in context: A335198 A335935 A347935 * A114837 A328149 A154548

Adjacent sequences:  A347935 A347936 A347937 * A347939 A347940 A347941

KEYWORD

nonn

AUTHOR

Amiram Eldar, Sep 20 2021

STATUS

approved

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Last modified August 17 12:30 EDT 2022. Contains 356189 sequences. (Running on oeis4.)