Numbers n such that (10^n-1)/9 is prime and can be written in the form a^2 + 3*b^2.

A216529

Numbers n such that (10^n-1)/9 is prime and can be written in the form a^2 + 3*b^2.

Terms

    a(0) =19a(1) =49081a(2) =109297a(3) =270343

External references