A139286 a(n) = 2^(2*prime(n) - 1).

8, 32, 512, 8192, 2097152, 33554432, 8589934592, 137438953472, 35184372088832, 144115188075855872, 2305843009213693952, 9444732965739290427392, 2417851639229258349412352, 38685626227668133590597632, 9903520314283042199192993792

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn
• less

Crossrefs

Cf. A000040, A000079, A076274, A139287, A139288, A139289, A139290, A139291, A139292, A139293, A139294, A139306.

Programs

Magma

[2^(2*p-1): p in PrimesUpTo(200)]; // Vincenzo Librandi, Dec 15 2010

Mathematica

2^(2Prime[Range[20]]-1) (* Harvey P. Dale, Dec 01 2017 *)

PARI

a(n)=2^(2*prime(n)-1) \\ Charles R Greathouse IV, Jul 02 2013

Extensions

Corrected and extended by Harvey P. Dale, Dec 01 2017