A176162 Primes p such that (p-2)/5 is not a prime number.

2, 3, 5, 7, 11, 13, 19, 23, 29, 31, 41, 43, 47, 53, 59, 61, 71, 73, 79, 83, 89, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 311

Offset

1,1

Comments

The old definition was "Start with the list of primes; accept 2 but remove the list of primes S(2); accept the next prime (3) but remove the list of primes S(3); repeat".

If p is a prime, S(p) denotes the list of primes {5p+2, 5(5p+2)+2, 5(5(5p+2)+2)+2, ...}, stopping as soon as we reach the first composite number.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Prime[Range[100]], !PrimeQ[(# - 2) / 5] &] (* Vincenzo Librandi, Sep 12 2013 *)

Crossrefs

Cf. A169647.

Sequence in context: A097375 A007459 A129944 * A152900 A079151 A274335

Adjacent sequences: A176159 A176160 A176161 * A176163 A176164 A176165

Keyword

nonn,easy

Author

Vincenzo Librandi, Apr 10 2010

Extensions

New definition from Jon E. Schoenfield, Jun 18 2010

Status

approved