OFFSET
1,1
LINKS
Pierre CAMI, Table of n, a(n) for n = 1..1000
EXAMPLE
1*2^1*(2^1-1)+1=3 prime so m(1)=2 1*2^2*(2^2-1)-1=11 as 13 so m(2)=2 1*2^3*(2^3-1)-1=55 composite 1*2^3*(2^3-1)+1=57 composite 1*3^3*(3^3-1)-1=71 prime as 73 so m(3)=3
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Dec 18 2008
STATUS
approved