A215446 Numbers k such that 11^k + k^11 - 1 is prime.

1, 7, 27, 43, 87, 223, 11589

Offset

1,2

Comments

a(8) > 2*10^5. - Robert Price, Nov 08 2014

Links

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

Mathematica

Select[Range[0, 5000], PrimeQ[11^# + #^11 - 1] &]

Prog

(Magma) [n: n in [0..2000] | IsPrime(11^n + n^11 - 1)]
(PARI) is(n)=isprime(11^n+n^11-1) \\ Charles R Greathouse IV, Feb 17 2017

Crossrefs

Sequence in context: A175377 A323113 A205861 * A098948 A015873 A344721

Adjacent sequences: A215443 A215444 A215445 * A215447 A215448 A215449

Keyword

nonn,hard,more

Author

Vincenzo Librandi, Sep 06 2012

Extensions

a(7) from Robert Price, Mar 15 2014

Status

approved