OFFSET
1,3
LINKS
Pierre CAMI, Table of n, a(n) for n = 1..200 [Corrected Oct 16 2008]
EXAMPLE
2*(2+1)-1=5 prime as 7 so a(1)=1 6*(6+1)-1=41 prime as 43 so a(2)=1
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Sep 26 2008
STATUS
approved