4-automorphic numbers: final digits of 4*n^2 agree with n.

A030987

4-automorphic numbers: final digits of 4*n^2 agree with n.

Terms

    a(0) =4a(1) =44a(2) =344a(3) =7344a(4) =77344a(5) =777344a(6) =6777344a(7) =46777344a(8) =446777344a(9) =446777344a(10) =20446777344a(11) =20446777344

External references