OFFSET
0,1
LINKS
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
FORMULA
EXAMPLE
6^3 + 1 = 217 = 7*31, so a(3) = 31.
MATHEMATICA
Table[FactorInteger[6^n + 1][[-1, 1]], {n, 0, 40}]
PROG
(Magma) [Maximum(PrimeDivisors(6^n+1)): n in [0..40]];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Jul 11 2016
EXTENSIONS
Terms to a(100) in b-file from Vincenzo Librandi, Jul 12 2016
a(101)-a(408) in b-file from Amiram Eldar, Feb 02 2020
a(409)-a(420) in b-file from Max Alekseyev, Apr 25 2022, Aug 26 2023
STATUS
approved