A139239 - OEIS

%I #8 Oct 20 2023 16:54:52

%S 2,12,48,960,3072,61440,196608,3932160,264241152,805306368,

%T 67645734912,1030792151040,3298534883328,65970697666560,

%U 4433230883192832,283726776524341248,864691128455135232,72634054790231359488,1106804644422573096960,3541774862152233910272,297509088420787648462848

%N First differences of Mersenne numbers A001348, divided by 2.

%H Paolo Xausa, <a href="/A139239/b139239.txt">Table of n, a(n) for n = 1..450</a>

%F a(n) = A139238(n)/2.

%t Differences[2^Prime[Range[25]]-1]/2 (* _Paolo Xausa_, Oct 20 2023 *)

%Y Cf. A001348, A139229, A139235, A139238, A139240, A139242.

%K easy,nonn

%O 1,1

%A _Omar E. Pol_, Apr 19 2008

%E a(10)-a(21) from _Paolo Xausa_, Oct 20 2023