OFFSET
1,1
COMMENTS
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..16
FORMULA
a(n) = A139236(n)/2.
MATHEMATICA
Differences[2^MersennePrimeExponent[Range[14]]-1, 2]/4 (* Paolo Xausa, Oct 20 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 18 2008
EXTENSIONS
More terms from Michel Marcus, Jul 09 2017
STATUS
approved