A139289 (2^(2p - 1)/2)-1, where p is prime.

3, 15, 255, 4095, 1048575, 16777215, 4294967295, 68719476735, 17592186044415, 72057594037927935, 1152921504606846975, 4722366482869645213695, 1208925819614629174706175, 19342813113834066795298815, 4951760157141521099596496895, 20282409603651670423947251286015, 83076749736557242056487941267521535

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn

Links

• Floris P. van Doorn and Jasper Mulder, Table of n, a(n) for n=1..260.

Crossrefs

Cf. A139286, A139287, A139288, A139290, A139291, A139292, A139293, A139294, A139306.

Programs

Mathematica

Table[(2^(2 Prime[p] - 1)/2) - 1, {p, 1, 20}] (* Floris P. van Doorn and Jasper Mulder (florisvandoorn(AT)hotmail.com), Oct 12 2009 *)

Formula

a(n) = A139286(n)/2 - 1.

Extensions

More terms from Floris P. van Doorn and Jasper Mulder (florisvandoorn(AT)hotmail.com), Oct 12 2009