login
A139286
a(n) = 2^(2*prime(n) - 1).
12
8, 32, 512, 8192, 2097152, 33554432, 8589934592, 137438953472, 35184372088832, 144115188075855872, 2305843009213693952, 9444732965739290427392, 2417851639229258349412352, 38685626227668133590597632, 9903520314283042199192993792
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
KEYWORD
nonn,less
AUTHOR
Omar E. Pol, Apr 13 2008
EXTENSIONS
Corrected and extended by Harvey P. Dale, Dec 01 2017
STATUS
approved