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

Author

Rémy Sigrist, Oct 28 2020

Keywords

• nonn

Examples

			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.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, C program for A338450

Crossrefs

Cf. A280774, A338338.

Programs

C

See Links section.