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A100358 Numbers n such that 2^n+n^3+1 is prime. 3

%I

%S 0,2,6,8,20,38,96,146,236,458,726,962,1422,2864,3858,5228,9822,21774,

%T 32336,33336,43556

%N Numbers n such that 2^n+n^3+1 is prime.

%C a(22) > 200000. - _Giovanni Resta_, Mar 23 2014

%C a(22) > 400000. - _Robert Price_, Sep 01 2014

%p A100358:=n->`if`(isprime(2^n+n^3+1),n,NULL): seq(A100358(n), n=0..10^3); # _Wesley Ivan Hurt_, Sep 01 2014

%t {ta={{0}}, tb={{0}}}; Do[g=n;s=2^n+n^3+1;If[PrimeQ[s], Print[n];ta=Append[ta, n];tb=Append[tb, s]], {n, 1, 10000}];{ta, tb, g}

%o (PARI)

%o for(n=1,10^5,if(ispseudoprime(2^n+n^3+1),print1(n,", "))) \\ _Derek Orr_, Sep 01 2014

%Y Cf. A001580, A069539, A100357.

%K more,nonn

%O 1,2

%A _Labos Elemer_, Nov 19 2004

%E a(17)-a(21) from _Giovanni Resta_, Mar 23 2014

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Last modified September 27 16:20 EDT 2020. Contains 337383 sequences. (Running on oeis4.)