A331588 a(n) is the least k such that A331587(n) = k * reverse(k) (where reverse(k) is the binary reversal of k, A030101(k)).

1, 3, 5, 7, 9, 11, 15, 17, 21, 19, 23, 27, 31, 33, 37, 35, 45, 39, 43, 51, 47, 55, 63, 65, 73, 69, 67, 77, 85, 75, 71, 83, 93, 79, 99, 91, 87, 107, 103, 95, 111, 119, 127, 129, 137, 133, 153, 141, 149, 131, 165, 157, 139, 147, 135, 173, 163, 155, 143, 151, 189

Offset

1,2

Links

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

Rémy Sigrist, PARI program for A331588

Formula

a(n) = A030101(A331589(n)).

a(n) * A331589(n) = A331587(n).

Prog

(PARI) See Links section.

Crossrefs

Cf. A030101, A331587, A331589.

Sequence in context: A165705 A209492 A118360 * A077799 A260124 A201646

Adjacent sequences: A331585 A331586 A331587 * A331589 A331590 A331591

Keyword

nonn,base

Author

Rémy Sigrist, Jan 21 2020

Status

approved