A215441 Numbers k such that 3^k + k^3 + 1 is prime.

0, 1, 7, 39, 97, 115, 199, 1287, 1411, 2713, 4647, 84985

Offset

1,3

Comments

a(13) > 2*10^5. - Robert Price, Mar 06 2014

Links

Table of n, a(n) for n=1..12.

Mathematica

Select[Range[0, 5000], PrimeQ[3^# + #^3 + 1] & ]

Prog

(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

Crossrefs

Cf. A215436.

Sequence in context: A158576 A304012 A329528 * A027482 A352310 A196782

Adjacent sequences: A215438 A215439 A215440 * A215442 A215443 A215444

Keyword

nonn

Author

Vincenzo Librandi, Sep 03 2012

Extensions

a(12) from Robert Price, Mar 06 2014

Status

approved