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A216618 Numbers k such that 10^k + k^10 + 1 is prime. 1
0, 726, 1974, 3336 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(5) > 10^5. - Robert Price, Oct 06 2015

LINKS

Table of n, a(n) for n=1..4.

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

Cf. A100357, A215434-A215446, A216375.

Sequence in context: A023680 A002769 A252617 * A185527 A306450 A259237

Adjacent sequences:  A216615 A216616 A216617 * A216619 A216620 A216621

KEYWORD

nonn,hard,more

AUTHOR

Vincenzo Librandi, Sep 11 2012

STATUS

approved

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Last modified June 30 18:52 EDT 2022. Contains 354945 sequences. (Running on oeis4.)