A157043 Primes p such that 6p-7, 6p-5, 6p-3, 6p-1 are not prime.

37, 89, 131, 151, 181, 191, 223, 233, 257, 281, 307, 367, 419, 461, 479, 499, 541, 547, 557, 571, 601, 641, 661, 673, 719, 739, 751, 757, 769, 797, 809, 839, 857, 887, 911, 937, 947, 1031, 1069, 1091, 1103, 1129, 1201, 1213, 1231, 1277, 1297, 1301, 1327

Offset

1,1

Links

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

Example

For p=37, (215,217,219,221 are not prime); p=89, (527,529,531,533 are not prime); p=131, (779,781,783,785 are not prime).

Mathematica

Select[ Prime@ Range@ 200, !PrimeQ[6 # - 1] && !PrimeQ[6 # - 3] && !PrimeQ[6 # - 5] && !PrimeQ[6 # - 7] &] (* Robert G. Wilson v, Apr 08 2009 *)
Select[Prime[Range[250]], NoneTrue[6#-{1, 3, 5, 7}, PrimeQ]&] (* Harvey P. Dale, Aug 11 2021 *)

Crossrefs

Cf. A157042.

Sequence in context: A350003 A330362 A285803 * A246930 A142525 A368850

Adjacent sequences: A157040 A157041 A157042 * A157044 A157045 A157046

Keyword

nonn,easy

Author

Vincenzo Librandi, Feb 22 2009

Extensions

More terms from Robert G. Wilson v, Apr 08 2009

Status

approved