A266410 a(n) = (A266419(n) - 1) / 2; numbers n such that 2n+1 is a nonludic number (in A192607).

4, 7, 9, 10, 13, 15, 16, 17, 19, 22, 24, 25, 27, 28, 29, 31, 32, 34, 36, 37, 39, 40, 42, 43, 46, 47, 49, 50, 51, 52, 54, 55, 56, 58, 61, 62, 64, 66, 67, 68, 69, 70, 72, 73, 75, 76, 77, 79, 81, 82, 83, 84, 85, 88, 91, 92, 93, 94, 95, 97, 98, 99, 100, 101, 102, 103, 106, 107, 108, 109, 112, 114, 115, 118, 120, 121

Offset: 1

Author

Antti Karttunen, Jan 28 2016

Keywords

• nonn

Comments

Odd nonludic numbers (A266419) decremented by one, then halved.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10220

Crossrefs

Complement: A266409.

Cf. A192490, A192607, A266419.

Cf. permutations A266418, A266638.

Cf. also A047845.

Formula

a(n) = (A266419(n) - 1) / 2.