A139293 (2^(2p - 1)/8)-1, where p is prime.

0, 3, 63, 1023, 262143, 4194303, 1073741823, 17179869183, 4398046511103, 18014398509481983, 288230376151711743, 1180591620717411303423, 302231454903657293676543, 4835703278458516698824703

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn

Crossrefs

Cf. A139286, A139287, A139288, A139289, A139290, A139291, A139292, A139294, A139306.

Programs

Mathematica

(2^(2#-1))/8-1&/@Prime[Range[30]] (* Harvey P. Dale, May 09 2012 *)

Formula

a(n) = (A139286(n)/8)-1.

Extensions

More terms from Jon E. Schoenfield, Jul 16 2010