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
Keywords
Links
- Michael De Vlieger, Table of n, a(n) for n = 1..10000
Programs
-
Mathematica
1 + 2 Position[#, 2] &@ Table[k = 1; While[! PrimeQ[k n + 1], k++]; k, {n, 165}] // Flatten (* Michael De Vlieger, Jul 31 2017 *) -
PARI
lista(nn) = for (n=1, nn, if (isprime(p=2*n+1) && !isprime(n+1), print1(p, ", "));); \\ Michel Marcus, Aug 01 2017
Extensions
Edited by N. J. A. Sloane, Oct 27 2012
Comments