login
A176002
Numbers n such that 15*prime(n)+{-4,-2,2,4} are all primes.
0
4, 6, 34, 176, 608, 1023, 1338, 1377, 1555, 1980, 2054, 2850, 2893, 3061, 3263, 3572, 3977, 4029, 4244, 4405, 6099, 6548, 7203, 7348, 7350, 7572, 7574, 9028, 10657, 11976, 12215, 12874, 13247, 13388, 13432, 14537, 14813, 15115, 15412, 15509
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.
FORMULA
A000040(a(n))=A112540(k).
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
EXTENSIONS
More terms from R. J. Mathar, Apr 16 2010
STATUS
approved