a(n) = smallest multiple of the n-th prime whose decimal expansion is nnn...n, or 0 if no such number exists.

A078251

a(n) = smallest multiple of the n-th prime whose decimal expansion is nnn...n, or 0 if no such number exists.

Terms

    a(0) =0a(1) =222a(2) =0a(3) =444444a(4) =55a(5) =666666a(11) =121212a(12) =1313131313

External references