A034849 a(n) = 1 + 2*A034784(n).

7, 11, 17, 19, 23, 29, 31, 41, 43, 47, 53, 59, 67, 71, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 163, 167, 173, 179, 181, 191, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 281, 283, 293, 307, 311, 317, 331

Offset

1,1

Comments

The terms are odd prime numbers.

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Mathematica

1 + 2 Position[#, 2] &@ Table[k = 1; While[! PrimeQ[k n + 1], k++]; k, {n, 165}] // Flatten (* Michael De Vlieger, Jul 31 2017 *)

Prog

(PARI) lista(nn) = for (n=1, nn, if (isprime(p=2*n+1) && !isprime(n+1), print1(p, ", ")); ); \\ Michel Marcus, Aug 01 2017

Crossrefs

Cf. A034693, A034694, A034784.

Sequence in context: A163996 A117743 A216495 * A269256 A106070 A346991

Adjacent sequences: A034846 A034847 A034848 * A034850 A034851 A034852

Keyword

nonn

Author

Labos Elemer

Extensions

Edited by N. J. A. Sloane, Oct 27 2012

Status

approved