Numbers k such that 5*10^(2*k) + 5*10^k + 1 is prime.

A309740

Numbers k such that 5*10^(2*k) + 5*10^k + 1 is prime.

Terms

    a(0) =0a(1) =3a(2) =5a(3) =301a(4) =13817a(5) =15259

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