A215443 - OEIS

A215443

Numbers k such that 5^k + k^5 - 1 is prime.

1, 3, 9, 13, 27, 225, 505, 1605, 7417, 9193, 9235

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OFFSET

1,2

COMMENTS

a(12) > 2*10^5. - Robert Price, May 24 2014

LINKS

MATHEMATICA

Select[Range[0, 3000], PrimeQ[5^# + #^5 - 1] &]

PROG

(Magma) [n: n in [0..300] | IsPrime(5^n + n^5 - 1)]

(PARI) is(n)=ispseudoprime(5^n+n^5-1) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(9)-a(11) from Robert Price, May 24 2014

STATUS

approved