2-automorphic numbers: final digits of 2*n^2 agree with n.

A030984

2-automorphic numbers: final digits of 2*n^2 agree with n.

Terms

    a(0) =8a(1) =88a(2) =688a(3) =4688a(4) =54688a(5) =554688a(6) =3554688a(7) =93554688a(8) =893554688a(9) =893554688a(10) =40893554688a(11) =40893554688a(12) =40893554688

External references