A121290 - OEIS

%I #11 Jul 22 2017 08:32:26

%S 0,1,5,85,341,5461,21845,349525,22369621,89478485,5726623061,

%T 91625968981,366503875925,5864062014805,375299968947541,

%U 24019198012642645,96076792050570581,6148914691236517205

%N a(n) = (2^prime(n) - 8)/24 for n>=2.

%C Previous name was: (2^(p-3) - 1)/3, where p is an odd prime, i.e., p = A065091.

%t Table[(2^Prime[n] - 8)/24, {n, 2, 100}] (* _Artur Jasinski_ *)

%Y Cf. A000043, A000668, A124477, A139479, A139480.

%K nonn,easy,less

%O 1,3

%A _Lekraj Beedassy_, Aug 24 2006

%E New name from _Joerg Arndt_, Jul 21 2017