Automorphic numbers: n^2 ends with n in base 6.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =9a(5) =28a(6) =81a(7) =136a(8) =1216a(9) =6561a(10) =16768a(11) =29889a(12) =76545a(13) =203392a(14) =636417a(15) =1043200a(16) =3995649a(17) =6082048a(18) =24151041a(19) =36315136a(20) =326481921a(21) =689278977a(22) =1487503360a(23) =11573190657a(24) =76876660737a(25) =155240824833a(26) =314944159744a(27) =785129144320