A353579 Numbers in the smallest subset of N containing 1 and closed under the mappings k->2^n + k, k->3*2^{n+1} + k, and k->3*2^{n+2} + k where n = ceiling(log_2(k)).

1, 2, 4, 7, 8, 13, 14, 15, 16, 26, 28, 29, 30, 31, 32, 52, 55, 56, 58, 60, 61, 62, 63, 64, 103, 104, 109, 110, 111, 112, 116, 119, 120, 122, 124, 125, 126, 127, 128, 205, 206, 207, 208, 218, 220, 221, 222, 223, 224, 231, 232, 237, 238, 239, 240, 244, 247, 248, 250, 252, 253, 254, 255, 256

Offset: 1

Author

Paul K. Stockmeyer, May 03 2022

Keywords

• nonn

Links

• Paul K. Stockmeyer, Table of n, a(n) for n = 1..1155
• Andreas M. Hinz and Paul K. Stockmeyer, Precious Metal Sequences and Sierpinski-Type Graphs, J. Integer Seq., Vol 25 (2022), Article 22.4.8.