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A062308
Largest prime factor of 11^n+1 (A034524).
7
2, 3, 61, 37, 7321, 13421, 1117, 1623931, 6304673, 590077, 212601841, 58367, 20113, 59583967, 55527473, 7537711, 447600088289, 2218331, 3138426605161, 1390636259, 1120648576818041, 3421169496361, 2649263870814793
OFFSET
0,1
FORMULA
a(n) = A006530(A034524(n)). - Vincenzo Librandi, Jul 12 2016
MATHEMATICA
Table[FactorInteger[11^n + 1][[-1, 1]], {n, 0, 20}] (* Vincenzo Librandi, Jul 12 2016 *)
PROG
(PARI) for(n=0, 22, print(factor(11^n+1)))
(PARI) { for (n=0, 80, f=factor(11^n + 1)~; write("b062308.txt", n, " ", f[1, length(f)]) ) } \\ Harry J. Smith, Aug 04 2009
(Magma) [Maximum(PrimeDivisors(11^n+1)): n in [0..40]]; // Vincenzo Librandi, Jul 12 2016
CROSSREFS
Cf. similar sequences listed in A274903.
Sequence in context: A112098 A144545 A085326 * A072875 A093551 A173915
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 12 2001
EXTENSIONS
Terms to a(80) in b-file from Harry J. Smith, Jun 01 2010
a(81)-a(301) in b-file from Amiram Eldar, Feb 08 2020
a(302)-a(325) in b-file from Max Alekseyev, Apr 25 2022, Oct 11 2023
STATUS
approved