A139290 2^(2p - 1)/4, where p is prime.

2, 8, 128, 2048, 524288, 8388608, 2147483648, 34359738368, 8796093022208, 36028797018963968, 576460752303423488, 2361183241434822606848, 604462909807314587353088, 9671406556917033397649408

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn

Crossrefs

Cf. A139286, A139287, A139288, A139289, A139290, A139292, A139293, A139294, A139306.

Programs

Magma

[2^(2*p-1)div 4: p in PrimesUpTo(200)]; // Vincenzo Librandi, Dec 15 2010

Mathematica

2^(2#-1)/4 & /@ Prime@ Range@ 15 (* Harvey P. Dale, Dec 16 2010 *)

Formula

a(n) = A139286(n)/4.

Extensions

More terms from Jon E. Schoenfield, Jul 16 2010