A126435 - OEIS

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A126435

Primes of the form n^7-n-1.

2097143, 1801088519, 21869999969, 42618442943, 78364164059, 137231006639, 194754273839, 435817657169, 678223072799, 1174711139783, 1727094849479, 3938980639103, 4398046511039, 4902227890559, 6722988818363, 19203908986079

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

All terms end in 3 or 9. - Robert Israel, Jul 22 2019

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

map(t -> t^7-t-1, select(t -> isprime(t^7-t-1), [$1..10^4])); # Robert Israel, Jul 22 2019

MATHEMATICA

k = 7; a = {}; Do[If[PrimeQ[x^k - x - 1], AppendTo[a, x^k - x - 1]], {x, 1, 100}]; a

Select[Table[n^7-n-1, {n, 80}], PrimeQ] (* Harvey P. Dale, Jun 20 2020 *)