A338450 Numbers k such that A338338(k) and A338338(k+1) are coprime.

1, 6, 10, 18, 37, 67, 77, 81, 90, 124, 156, 160, 185, 205, 259, 289, 330, 376, 429, 452, 492, 501, 513, 600, 609, 618, 622, 674, 683, 710, 743, 796, 821, 945, 1038, 1060, 1086, 1214, 1312, 1316, 1493, 1556, 1735, 1764, 1929, 1938, 2052, 2216, 2230, 2259, 2521

Offset

1,2

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, C program for A338450

Example

gcd(A338338(6), A338338(7)) = gcd(9, 5) = 1, so 6 belongs to the sequence.
gcd(A338338(2), A338338(3)) = gcd(2, 4) = 2, so 2 does not belong to the sequence.

Prog

(C) See Links section.

Crossrefs

Cf. A280774, A338338.

Sequence in context: A079471 A134351 A307458 * A287273 A138828 A109312

Adjacent sequences: A338447 A338448 A338449 * A338451 A338452 A338453

Keyword

nonn

Author

Rémy Sigrist, Oct 28 2020

Status

approved