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

Author

Antti Karttunen, May 19 2022

Keywords

• nonn

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.

Examples

			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.
		

Crossrefs

Subsequence of A072202 and of A354189.

Primitive elements are {2} U A048630.

Cf. A354193 (characteristic function), A000079 (subsequence), A267099.

Programs

PARI

isA354192(n) = A354193(n);