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A216618
Numbers k such that 10^k + k^10 + 1 is prime.
1
0, 726, 1974, 3336
OFFSET
1,2
COMMENTS
a(5) > 10^5. - Robert Price, Oct 06 2015
MATHEMATICA
Select[Range[0, 5000], PrimeQ[10^# + #^10 + 1] &]
PROG
(PARI) is(n)=ispseudoprime(10^n+n^10+1) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Vincenzo Librandi, Sep 11 2012
STATUS
approved