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A126424 Numbers k for which k^4-k-1 is prime. 18

%I #12 Mar 13 2020 13:01:12

%S 2,4,5,6,7,9,11,13,16,20,23,26,39,40,42,44,50,53,55,57,60,61,68,71,77,

%T 79,82,92,110,111,112,123,137,139,140,147,153,154,156,169,172,174,177,

%U 183,187,189,193,198,207,214,229,230,231,239,251,258,259,272,274,279

%N Numbers k for which k^4-k-1 is prime.

%H Amiram Eldar, <a href="/A126424/b126424.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from T. D. Noe)

%t a = {}; Do[If[PrimeQ[x^4 - x - 1], AppendTo[a, x]], {x, 1, 1000}]; a

%Y Cf. A002327, A002328, A116581, A126420, A126421, A126422, A126423.

%K nonn

%O 1,1

%A _Artur Jasinski_, Dec 26 2006

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Last modified April 10 17:05 EDT 2024. Contains 371607 sequences. (Running on oeis4.)