Triangular numbers composed of digits {0,4,5}.

Terms

a(0) =45a(1) =55a(2) =4005a(3) =5050a(4) =404550a(5) =405450a(6) =500500a(7) =40405555a(8) =40504500a(9) =50005000a(10) =454044045a(11) =500054500a(12) =4050045000a(13) =4540044405a(14) =5000050000a(15) =405000450000a(16) =455005054540a(17) =500000500000