Triangular numbers composed of digits {2,6,8}.

Terms

a(0) =6a(1) =28a(2) =66a(3) =666a(4) =2628a(5) =228826a(6) =828828a(7) =2222886a(8) =66268828a(9) =222868828a(10) =286262628a(11) =628262628a(12) =688668828a(13) =862266628a(14) =2266226826