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A324941
Largest prime factor of 17^n + 1.
2
2, 3, 29, 13, 41761, 101, 83233, 22796593, 184417, 5653, 63541, 87415373, 72337, 2001793, 100688449, 238212511, 52548582913, 45957792327018709121, 382069, 20352763, 1186844128302568601, 88109799136087, 6901823633, 1109309383381084655697725873, 48661191868691111041
OFFSET
0,1
LINKS
FORMULA
a(n) = A006530(A224384(n)).
MATHEMATICA
Table[FactorInteger[17^n + 1] [[-1, 1]], {n, 0, 30}]
PROG
(Magma) [Maximum(PrimeDivisors(17^n + 1)): n in [0..40]];
(PARI) a(n) = vecmax(factor(17^n+1)[, 1]); \\ Jinyuan Wang, Apr 05 2019
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Apr 05 2019
STATUS
approved