A254099 Fixed points of A254115 and A254116.

1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 14, 16, 20, 22, 24, 28, 32, 40, 44, 48, 56, 64, 80, 88, 96, 112, 128, 160, 176, 192, 224, 256, 317, 320, 352, 384, 448, 512, 634, 640, 704, 768, 896, 1024, 1268, 1280, 1408, 1536, 1792, 2048, 2536, 2560, 2816, 3072, 3584, 4096, 5072, 5120, 5632, 6144, 7168, 8192, 10144, 10240, 11264

Offset: 1

Author

Antti Karttunen, Feb 04 2015

Keywords

• nonn

Comments

If n is a member, then 2n is as well, and vice versa, thus the sequence is completely determined by its odd terms: 1, 3, 5, 7, 11, 317, 15989189, 16964283, ...

Links

• Antti Karttunen, Table of n, a(n) for n = 1..152

Crossrefs

Subsequence: A000079.

Cf. A254115, A254116.

Programs

PARI

\\ Needs also code from A254116:
isA254099(n) = (A254116(n) == n);
i=0; for(n=1, 123456789, if(isA254099(n), i++; write("b254099.txt", i, " ", n)))
(Scheme, with Antti Karttunen's IntSeq-library)
(define A254099 (FIXED-POINTS 1 1 A254115))