OFFSET
1,1
COMMENTS
Also: primes that are sums of three consecutive terms of A001651. These sum to either 3k+1+3k+2+3k+4=9k+7, candidates for A061241, or 3k+2+3k+4+3k+5=9k+11, candidates for A061238. - R. J. Mathar, Jun 10 2007
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Emma Lehmer, On special primes, Pac. J. Math., 118 (1985), 471-478.
FORMULA
MATHEMATICA
Select[Prime[Range[1000]], MemberQ[{7, 11}, Mod[ #, 18]]&] (* Zak Seidov, May 23 2007 *)
PROG
(Magma) [ p: p in PrimesUpTo(1300) | p mod 18 in {7, 11} ]; // Vincenzo Librandi, Aug 14 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 22 2007
STATUS
approved