A331589 a(n) is the greatest k such that A331587(n) = k * reverse(k) (where reverse(k) is the binary reversal of k, A030101(k)).

1, 3, 5, 7, 9, 13, 15, 17, 21, 25, 29, 27, 31, 33, 41, 49, 45, 57, 53, 51, 61, 59, 63, 65, 73, 81, 97, 89, 85, 105, 113, 101, 93, 121, 99, 109, 117, 107, 115, 125, 123, 119, 127, 129, 145, 161, 153, 177, 169, 193, 165, 185, 209, 201, 225, 181, 197, 217, 241

Offset

1,2

Links

Rémy Sigrist, Table of n, a(n) for n = 1..8347

Rémy Sigrist, PARI program for A331589

Formula

a(n) = A030101(A331588(n)).

a(n) * A331588(n) = A331587(n).

Prog

(PARI) See Links section.

Crossrefs

Cf. A030101, A331587, A331588.

Sequence in context: A355773 A119253 A307001 * A063951 A131437 A003553

Adjacent sequences: A331586 A331587 A331588 * A331590 A331591 A331592

Keyword

nonn,base

Author

Rémy Sigrist, Jan 21 2020

Status

approved