OFFSET
1,1
COMMENTS
Numbers n such that 15*prime(n)-4, 15*prime(n)-2, 15*prime(n)+2 and 15*prime(n)+4 are primes.
EXAMPLE
a(1)=4 because 15*prime(4)-4=101, 15*prime(4)-2=103, 15*prime(4)+2=107 and 15*prime(4)+4=109.
MATHEMATICA
p15Q[n_]:=And@@PrimeQ/@(15 Prime[n]+{-4, -2, 2, 4}); Select[Range[16000], p15Q] (* Harvey P. Dale, Mar 20 2011 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Apr 11 2010
EXTENSIONS
More terms from R. J. Mathar, Apr 16 2010
STATUS
approved