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A243811
Numbers n such that 2*n+3 and 2*n+5 are both prime.
2
0, 1, 4, 7, 13, 19, 28, 34, 49, 52, 67, 73, 88, 94, 97, 112, 118, 133, 139, 154, 172, 208, 214, 229, 259, 283, 298, 307, 319, 328, 403, 409, 412, 427, 439, 508, 514, 523, 529, 544, 574, 613, 637, 643, 649, 658, 712, 724, 739, 742, 802, 808, 832, 847, 859, 892, 934
OFFSET
1,3
LINKS
FORMULA
a(n) = A040040(n)-2.
MATHEMATICA
Select[Range[0, 1000], PrimeQ[2 # + 3] && PrimeQ[2 # + 5] &]
PROG
(Magma) [n: n in [0..1000] | IsPrime(2*n+3) and IsPrime(2*n+5)];
CROSSREFS
KEYWORD
nonn,easy,less
AUTHOR
Vincenzo Librandi, Jun 11 2014
STATUS
approved