The On-Line Encyclopedia of Integer Sequences (OEIS)

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A355895 revision #13

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

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.

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Cf. A354790, A355896.

Sequence in context: A288832 A164808 A378680 * A153285 A083557 A119324

Adjacent sequences: A355892 A355893 A355894 * A355896 A355897 A355898

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 27 2022

EXTENSIONS

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

STATUS

reviewed