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A138644 Primes p such that 5*p+2 is composite. 1
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 (list; graph; refs; listen; history; text; internal format)
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 * A164921 A156830 A140556

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

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Last modified October 16 12:23 EDT 2021. Contains 348041 sequences. (Running on oeis4.)