3-automorphic numbers: positive integers k such that 3k^2 ends with k.

Terms

a(0) =2a(1) =5a(2) =7a(3) =67a(4) =75a(5) =92a(6) =667a(7) =792a(8) =875a(9) =6667a(10) =6875a(11) =9792a(12) =66667a(13) =69792a(14) =96875a(15) =296875a(16) =369792a(17) =666667a(18) =2369792a(19) =4296875a(20) =6666667a(21) =62369792a(22) =66666667a(23) =262369792a(24) =404296875a(25) =666666667a(26) =6666666667a(27) =7262369792a(28) =9404296875a(29) =27262369792