A088561 A088555 indexed by A000040.

11, 13, 18, 20, 26, 36, 43, 47, 53, 58, 64, 79, 82, 94, 98, 100, 105, 116, 121, 125, 126, 133, 135, 142, 156, 164, 167, 178, 190, 193, 197, 210, 216, 218, 233, 248, 271, 279, 286, 291, 297, 305, 318, 326, 331, 335, 344, 347, 362, 369, 374, 381, 395, 400, 406

Offset: 1

Author

Ray Chandler, Nov 28 2003

Keywords

• nonn
• easy

Comments

Subset of A049511.

Crossrefs

Cf. A023219, A049511, A088555, A090161.

Formula

a(n) = k such that A000040(k) = A088555(n).

a(n) = A000720(A088555(n)). - Michel Marcus, Aug 06 2021

Extensions

Offset changed to 1 by Jinyuan Wang, Aug 06 2021