Triangular numbers with only even digits.

Terms

a(0) =0a(1) =6a(2) =28a(3) =66a(4) =406a(5) =666a(6) =820a(7) =2080a(8) =2628a(9) =8646a(10) =28680a(11) =42486a(12) =48828a(13) =64620a(14) =66066a(15) =80200a(16) =84666a(17) =200028a(18) =204480a(19) =228826a(20) =264628a(21) =288420a(22) =426426a(23) =446040a(24) =468028a(25) =484620a(26) =600060a(27) =626640a(28) =644680a(29) =686206