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Numbers k such that (10^k-1)^2 + 2 is prime.
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%I #17 Sep 20 2024 12:27:16

%S 0,1,2,4,5,17,18,23,57,58,340,837,4280,5352,13675,17515,25856

%N Numbers k such that (10^k-1)^2 + 2 is prime.

%C No more terms up to k = 4000.

%o (PARI) is(n)=ispseudoprime((10^n-1)^2+2) \\ _Charles R Greathouse IV_, Jun 13 2017

%K more,nonn

%O 1,3

%A _Jason Earls_, Dec 03 2009

%E a(13)-a(14) from _Michael S. Branicky_, Jun 21 2023

%E Offset changed by _Andrew Howroyd_, Sep 18 2024

%E a(15)-a(17) from _Michael S. Branicky_, Sep 20 2024