OFFSET
1,1
LINKS
J. Brillhart et al., Factorizations of b^n +- 1, Contemporary Mathematics, Vol. 22, Amer. Math. Soc., Providence, RI, 3rd edition, 2002.
EXAMPLE
11^4 - 1 = 14640 = 2^4*3*5*61, so a(4) = 61.
MATHEMATICA
Table[FactorInteger[11^n - 1][[-1, 1]], {n, 40}]
PROG
(Magma) [Maximum(PrimeDivisors(11^n-1)): n in [1..40]];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Jul 11 2016
EXTENSIONS
Terms to a(70) in b-file from Vincenzo Librandi, Jul 13 2016
a(71)-a(306) in b-file from Amiram Eldar, Feb 08 2020
a(307)-a(316) in b-file from Max Alekseyev, Apr 25 2022, Oct 26 2023
STATUS
approved