A176897 Primes p such that (p+1)/2 is not prime.

2, 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

Primes not in A005383. 2 together with A034849.

The Ramanujan primes, A104272, are a subsequence.

Links

Table of n, a(n) for n=1..57.

Mathematica

Select[Prime[Range[100]], ! PrimeQ[(#+1)/2] &]

Crossrefs

Sequence in context: A049635 A079140 A357843 * A362770 A166005 A243009

Adjacent sequences: A176894 A176895 A176896 * A176898 A176899 A176900

Keyword

nonn

Author

Juri-Stepan Gerasimov, Apr 28 2010

Extensions

Entries checked by R. J. Mathar, May 01 2010

Status

approved