A331587 -id:A331587

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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)).

+20
3

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

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

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.

KEYWORD

nonn,base

AUTHOR

Rémy Sigrist, Jan 21 2020

STATUS

approved

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)).

+20
3

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