OFFSET
1,1
FORMULA
a(n) =if (2^n-1)/(Prime[m]^2-n^2-1)=Integer then n
MATHEMATICA
digits=300 a=Delete[Union[Flatten[Table[If[ IntegerQ[(2^n-1)/(Prime[m]^2-n^2-1)]==True, n, 0], {n, 1, digits}, {m, 1, digits}]]], 1]
CROSSREFS
KEYWORD
nonn,uned
AUTHOR
Roger L. Bagula, Jul 06 2004
STATUS
approved