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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

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

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Author

N. J. A. Sloane, Aug 27 2022

Keywords

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
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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