Hexamorphic numbers: k such that the k-th hexagonal number ends with k.

Terms

a(0) =1a(1) =5a(2) =6a(3) =25a(4) =26a(5) =50a(6) =51a(7) =75a(8) =76a(9) =125a(10) =376a(11) =500a(12) =501a(13) =625a(14) =876a(15) =4376a(16) =5000a(17) =5001a(18) =5625a(19) =9376a(20) =40625a(21) =50000a(22) =50001a(23) =59376a(24) =90625a(25) =109376a(26) =390625a(27) =500000a(28) =500001a(29) =609376