Numbers k such that (10^(k+2) + 999) * 10^k + 1 is prime.

A246804

Numbers k such that (10^(k+2) + 999) * 10^k + 1 is prime.

Terms

    a(0) =1a(1) =3a(2) =15a(3) =135a(4) =645a(5) =1373a(6) =195317a(7) =237249

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