A266419 -id:A266419 - cp's OEIS frontend

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

Antti Karttunen, Jan 28 2016

nonn

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

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

Complement: A266409.
Cf. A192490, A192607, A266419.
Cf. permutations A266418, A266638.
Cf. also A047845.

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

A266420 Odd unlucky numbers.

Original entry on oeis.org

5, 11, 17, 19, 23, 27, 29, 35, 39, 41, 45, 47, 53, 55, 57, 59, 61, 65, 71, 77, 81, 83, 85, 89, 91, 95, 97, 101, 103, 107, 109, 113, 117, 119, 121, 123, 125, 131, 137, 139, 143, 145, 147, 149, 153, 155, 157, 161, 165, 167, 173, 175, 177, 179, 181, 183, 185, 187, 191, 197, 199, 203, 207, 209, 213, 215, 217, 221, 225

Offset: 1

Antti Karttunen, Jan 28 2016

nonn

Antti Karttunen, Table of n, a(n) for n = 1..10000

Intersection of A005408 and A050505.
Cf. A145649, A257726.
Cf. also A071904, A266419

cp's OEIS Frontend

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

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