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A336353 Numbers k such that sigma(k) does not have any prime factor larger than the largest prime factor of k. 5
1, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, 19, 21, 22, 23, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 46, 47, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 65, 66, 67, 68, 69, 70, 71, 73, 74, 76, 77, 78, 79, 82, 83, 84, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Note that the terms after 1 do not form a subsequence of A102750: the first counterexample is 343 = 7^3. See A336354.
LINKS
PROG
(PARI) isA336353(n) = !A336352(n);
CROSSREFS
Positions of zeros in A336352.
Subsequences: A000396, A001599, A065091, A105402, A333646 (see comment there), A336354.
Sequence in context: A253550 A295307 A073803 * A182851 A281995 A304452
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 19 2020
STATUS
approved

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Last modified March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)