11683872768domain: NAppears in sequences7-automorphic numbers ending in 8: final digits of 7n^2 agree with n.at n=10A0309927-automorphic numbers ending in 8: final digits of 7n^2 agree with n.at n=11A0309927-automorphic numbers ending in 8: final digits of 7n^2 agree with n.at n=12A030992