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A216423 Numbers k such that 4^k + k^4 + 1 is prime. 3
0, 6, 12, 3804, 8346, 15528, 147036 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(8) > 2*10^5. - Robert Price, Apr 29 2014

a(1)-a(3) are trivially prime.  a(4)-a(7) are probable primes. - Robert Price, May 07 2014

LINKS

Table of n, a(n) for n=1..7.

MATHEMATICA

Select[Range[0, 5000], PrimeQ[4^# + #^4 + 1] &]

PROG

(PARI) is(n)=ispseudoprime(4^n+n^4+1) \\ Charles R Greathouse IV, Jun 06 2017

CROSSREFS

Cf. A100357, A215434-A215446, A216375.

Sequence in context: A036900 A159282 A202383 * A229336 A070396 A130012

Adjacent sequences:  A216420 A216421 A216422 * A216424 A216425 A216426

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Sep 07 2012

EXTENSIONS

a(5)-a(7) from Robert Price, Apr 29 2014

STATUS

approved

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Last modified April 6 15:41 EDT 2020. Contains 333276 sequences. (Running on oeis4.)