OFFSET
1,1
MATHEMATICA
2^(2Prime[Range[20]]-1) (* Harvey P. Dale, Dec 01 2017 *)
PROG
(Magma)[2^(2*p-1): p in PrimesUpTo(200)] // Vincenzo Librandi, Dec 15 2010
(PARI) a(n)=2^(2*prime(n)-1) \\ Charles R Greathouse IV, Jul 02 2013
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Omar E. Pol, Apr 13 2008
EXTENSIONS
Corrected and extended by Harvey P. Dale, Dec 01 2017
STATUS
approved