OFFSET
1,1
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..36
Dario Alpern, Factorization using the Elliptic Curve Method.
MATHEMATICA
Select[Table[2^n - n^2, {n, 100}], PrimeOmega[#] == 2&] (* Vincenzo Librandi, Sep 21 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Oct 18 2004
STATUS
approved