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A126422
Primes of the form k^4-k-1.
11
13, 251, 619, 1289, 2393, 6551, 14629, 28547, 65519, 159979, 279817, 456949, 2313401, 2559959, 3111653, 3748051, 6249949, 7890427, 9150569, 10555943, 12959939, 13845779, 21381307, 25411609, 35152963, 38950001, 45212093
OFFSET
1,1
LINKS
FORMULA
a(n) = A126423(A126424(n)). - Amiram Eldar, Mar 13 2020
MATHEMATICA
a = {}; Do[If[PrimeQ[x^4 - x - 1], AppendTo[a, x^4 - x - 1]], {x, 1, 100}]; a
Select[Table[n^4-n-1, {n, 100}], PrimeQ] (* Harvey P. Dale, Aug 27 2013 *)
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 26 2006
EXTENSIONS
Definition corrected by Charles R Greathouse IV, Mar 11 2008
STATUS
approved