A139238 First differences of Mersenne numbers A001348.
4, 24, 96, 1920, 6144, 122880, 393216, 7864320, 528482304, 1610612736, 135291469824, 2061584302080, 6597069766656, 131941395333120, 8866461766385664, 567453553048682496, 1729382256910270464, 145268109580462718976, 2213609288845146193920
Offset: 1
Examples
a(2)=24 because A001348(2)=7 and A001348(2+1)=31 then 31-7 = 24.
Links
- Felix Fröhlich, Table of n, a(n) for n = 1..59
Crossrefs
Programs
-
Maple
A139238:=n->2^ithprime(n+1)-2^ithprime(n): seq(A139238(n), n=1..20); # Wesley Ivan Hurt, Jul 02 2014
-
Mathematica
Table[2^Prime[n + 1] - 2^Prime[n], {n, 20}] (* Wesley Ivan Hurt, Jul 02 2014 *) -
PARI
for(n=1, 20, d=2^prime(n+1)-2^prime(n); print1(d, ", ")) \\ Felix Fröhlich, Jun 30 2014
Formula
Extensions
a(10)-a(19) from Felix Fröhlich, Jun 30 2014
Comments