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A215441 Numbers k such that 3^k + k^3 + 1 is prime. 4
0, 1, 7, 39, 97, 115, 199, 1287, 1411, 2713, 4647, 84985 (list; graph; refs; listen; history; text; internal format)
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 A196782 A128554

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

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Last modified January 23 16:47 EST 2020. Contains 331172 sequences. (Running on oeis4.)