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A354192
Fixed points of permutation A267099.
4
1, 2, 4, 8, 15, 16, 30, 32, 60, 64, 91, 120, 128, 182, 187, 225, 240, 256, 364, 374, 450, 480, 512, 551, 728, 748, 851, 900, 960, 1024, 1102, 1271, 1365, 1456, 1496, 1702, 1800, 1920, 2048, 2204, 2279, 2542, 2730, 2805, 2867, 2912, 2992, 3375, 3404, 3600, 3840, 4096, 4307, 4408, 4558, 5084, 5460, 5610, 5734, 5824, 5963
OFFSET
1,2
COMMENTS
If k is included, then also 2*k is present. All terms of A048630, i.e., semiprimes p*q where q = A267099(p) are present, as well as their powers, and any products of their combinations.
EXAMPLE
As A267099(3) = 5 and A267099(5) = 3, 15 = 3*5 is present, as well as any 15^k and 2^k * 15, for k >= 0.
As A267099(7) = 13 and A267099(13) = 7, 91 = 7*13 is present, and also 91*15 = 1365 is present.
PROG
(PARI) isA354192(n) = A354193(n);
CROSSREFS
Subsequence of A072202 and of A354189.
Primitive elements are {2} U A048630.
Cf. A354193 (characteristic function), A000079 (subsequence), A267099.
Sequence in context: A072202 A354189 A275474 * A076351 A140117 A328677
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 19 2022
STATUS
approved