A215442 Numbers k such that 5^k + k^5 + 1 is prime.

0, 1, 7, 11, 35, 863, 3503, 5101

Offset: 1

Author

Vincenzo Librandi, Sep 03 2012

Keywords

• nonn
• more

Comments

a(9) > 2*10^5. - Robert Price, May 17 2014

Crossrefs

Cf. A215438.

Programs

Magma

[k: k in [0..200] | IsPrime(5^k + k^5 + 1)];

Mathematica

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

PARI

is(n)=ispseudoprime(5^n+n^5+1) \\ Charles R Greathouse IV, May 22 2017

Extensions

a(7)-a(8) from Robert Price, May 17 2014