S000660


Largest prime factor of 7^n - 6^n.

1, 13, 127, 17, 821, 127, 543607, 3697, 12547, 821, 18140783, 1933, 20021093, 543607, 3729391, 21089, 726751, 90217, 25565862643, 19681, 1554841, 18140783, 565511002489942841, 4332721, 146934809201, 650589967, 93637, 26412541

1

S000660

We include the first term even though it is not prime. The n that produce prime 7^n - 6^n are in A062573.

T. D. Noe, Plot of 100 terms

T. D. Noe, Table of 100 terms

Eric W. Weisstein, MathWorld: Greatest Prime Factor

(Mma) Table[FactorInteger[7^n - 6^n][[-1, 1]], {n, 40}]

Cf. A062573, S000650-S000668.

nonn

T. D. Noe, Jun 08 2015

© Tony D Noe 2014-2015