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A176897 Primes p such that (p+1)/2 is not prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A190750 A049635 A079140 * A166005 A243009 A155009

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

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Last modified May 9 04:53 EDT 2021. Contains 343687 sequences. (Running on oeis4.)