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A220787
Numbers k such that k^11 + 11*k + 11^k is prime.
2
1, 15, 18, 167, 684, 698, 1642, 3691, 4245, 5370, 6238, 6926, 9646, 10656, 10999, 11868, 14188, 35787
OFFSET
1,2
COMMENTS
a(13) > 9000. - Tyler NeSmith, Jul 26 2021
MATHEMATICA
Select[Range[5000], PrimeQ[#^11 + 11*# + 11^#]&]
PROG
(PARI) is(n)=ispseudoprime(n^11+11*n+11^n) \\ Charles R Greathouse IV, Jun 06 2017
CROSSREFS
Cf. A220653.
Sequence in context: A274979 A083823 A222682 * A167322 A217406 A181664
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Jan 07 2013
EXTENSIONS
a(10)-a(12) from Tyler NeSmith, Jul 26 2021
a(13)-a(15) from Michael S. Branicky, Jan 13 2023
a(16)-a(17) from Michael S. Branicky, Apr 22 2023
a(18) from Michael S. Branicky, Sep 19 2024
STATUS
approved