OFFSET
1,1
COMMENTS
Next term > 10^4.
a(5) > 10^5. - Robert Price, Oct 08 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