OFFSET
1,1
EXAMPLE
2*((2^2-1)^2)-1=17 prime so a(1)=2.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Pierre CAMI, Oct 08 2004
EXTENSIONS
a(19)-a(22) from Donovan Johnson, Mar 23 2008
a(23)-a(29) from Pierre CAMI, Feb 15 2014
STATUS
approved