A171582 - OEIS

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A171582

Numbers k such that 10^k*(4+3*10^k)+3 is prime.

%I #15 Oct 31 2024 17:46:15

%S 2,6,72,246,273,292,915,14460,17830

%N Numbers k such that 10^k*(4+3*10^k)+3 is prime.

%C No more terms up to k = 7200.

%o (PARI) is(n)=ispseudoprime(10^n*(4+3*10^n)+3) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A171583.

%K more,nonn

%O 1,1

%A _Jason Earls_, Dec 12 2009

%E a(8) from _Michael S. Branicky_, Jun 24 2023

%E a(9) from _Michael S. Branicky_, Oct 31 2024