OFFSET
1,1
COMMENTS
a(n) == 3 (mod 4).
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[ Table[2(Prime[i] + Prime[i + 1]) - 1, {i, 150}], PrimeQ[ # ] &] (* Robert G. Wilson v, Sep 19 2004 *)
Select[2*Total[#]-1&/@Partition[Prime[Range[200]], 2, 1], PrimeQ] (* Harvey P. Dale, Oct 15 2015 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Giovanni Teofilatto, Sep 18 2004
EXTENSIONS
More terms from Robert G. Wilson v, Sep 19 2004
STATUS
approved