OFFSET
1,1
LINKS
Floris P. van Doorn and Jasper Mulder, Table of n, a(n) for n=1,...,260.
FORMULA
a(n)=(A139286(n)/2)-1.
MATHEMATICA
Table[(2^(2 Prime[p] - 1)/2) - 1, {p, 1, 20}] [From Floris P. van Doorn and Jasper Mulder (florisvandoorn(AT)hotmail.com), Oct 12 2009]
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
EXTENSIONS
More terms from Floris P. van Doorn and Jasper Mulder (florisvandoorn(AT)hotmail.com), Oct 12 2009
STATUS
approved