A354192 Fixed points of permutation A267099.

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.

Links

Table of n, a(n) for n=1..61.

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

Adjacent sequences: A354189 A354190 A354191 * A354193 A354194 A354195

Keyword

nonn

Author

Antti Karttunen, May 19 2022

Status

approved