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A215446 Numbers k such that 11^k + k^11 - 1 is prime. 9
1, 7, 27, 43, 87, 223, 11589 (list; graph; refs; listen; history; text; internal format)
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 A309335

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

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Last modified January 24 13:24 EST 2020. Contains 331193 sequences. (Running on oeis4.)