Largest prime factor of 9^n - 2^n.
7, 11, 103, 17, 8431, 103, 97609, 6577, 4231, 8431, 194913401, 103, 363123688591, 434827, 1092601, 95873, 17390179040183, 4231, 174958129474481, 8431, 222110725159, 259347617, 47531034164447, 42942001, 5453401, 363123688591, 197131969, 949621
1
T. D. Noe, Plot of 100 terms
T. D. Noe, Table of 100 terms
Eric W. Weisstein, MathWorld: Greatest Prime Factor
(Mma) Table[FactorInteger[9^n - 2^n][[-1, 1]], {n, 40}]
nonn
T. D. Noe, Jun 08 2015