A355895 Even terms in A354790, divided by 2, in order of appearance.

1, 3, 11, 7, 17, 41, 37, 83, 79, 109, 241, 239, 499, 491, 1117, 1109, 2539, 2531, 5623, 5591, 11471, 11467, 23369, 23357

Offset: 1

Author

N. J. A. Sloane, Aug 27 2022

Keywords

• nonn
• more

Comments

The even terms in A354790 appear at indices 2, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, ... and conjecturally at indices 2^k-1 for all k >= 3.

Crossrefs

Cf. A354790, A355896.

Extensions

a(16)-a(24) from Rémy Sigrist, Aug 29 2022