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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
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.
Sequence in context: A335198 A335935 A347935 * A114837 A328149 A154548
KEYWORD
nonn
AUTHOR
Amiram Eldar, Sep 20 2021
STATUS
approved

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Last modified May 23 16:36 EDT 2024. Contains 372765 sequences. (Running on oeis4.)