A138644 Primes p such that 5*p+2 is composite.

2, 5, 11, 17, 23, 29, 37, 41, 43, 47, 53, 59, 71, 83, 89, 101, 103, 107, 113, 127, 131, 137, 139, 149, 163, 167, 173, 179, 191, 197, 211, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 317, 337, 347, 353, 359, 367, 379, 383, 389

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..2500

Example

5*2+2=12, 5*5+2=27, 5*11+2=57,...

Mathematica

a={}; Do[p=Prime[n]; If[ !PrimeQ[5*p+2], AppendTo[a, p]], {n, 8^2}]; a
Select[Prime[Range[100]], !PrimeQ[5#+2]&] (* Harvey P. Dale, Nov 07 2013 *)

Crossrefs

Sequence in context: A140559 A067775 A140552 * A350314 A164921 A156830

Adjacent sequences: A138641 A138642 A138643 * A138645 A138646 A138647

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, May 15 2008

Extensions

More terms from Vincenzo Librandi, Apr 01 2010

Status

approved