A090161 A023219 indexed by A000040.

3, 4, 5, 6, 8, 10, 12, 13, 15, 16, 18, 22, 23, 25, 27, 28, 30, 31, 32, 33, 34, 35, 36, 38, 42, 44, 45, 47, 50, 51, 52, 55, 56, 58, 62, 65, 69, 72, 74, 75, 77, 79, 82, 83, 86, 87, 89, 91, 93, 96, 97, 99, 100, 101, 102, 104, 105, 108, 109, 110, 111, 117, 119, 120, 122, 123

Offset: 1

Author

Ray Chandler, Nov 28 2003

Keywords

• nonn
• easy

Crossrefs

Cf. A023219, A088555, A088561.

Formula

a(n) = k such that A000040(k) = A023219(n).

a(n) = A000720(A023219(n)). - Michel Marcus, Aug 06 2021

Extensions

Offset changed to 1 by Jinyuan Wang, Aug 06 2021