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1,3
a(13) > 2*10^5. - Robert Price, Mar 06 2014
Table of n, a(n) for n=1..12.
Select[Range[0, 5000], PrimeQ[3^# + #^3 + 1] & ]
(MAGMA) [n: n in [0..800] | IsPrime(3^n+n^3+1)];
(PARI) is(n)=isprime(3^n+n^3+1) \\ Charles R Greathouse IV, Mar 06 2014
Cf. A215436.
Sequence in context: A158576 A304012 A329528 * A027482 A196782 A128554
Adjacent sequences: A215438 A215439 A215440 * A215442 A215443 A215444
nonn
Vincenzo Librandi, Sep 03 2012
a(12) from Robert Price, Mar 06 2014
approved