Numbers k such that the decimal representation of k is contained as substring in that of the k-th triangular number.

A119238

Numbers k such that the decimal representation of k is contained as substring in that of the k-th triangular number.

Terms

    a(0) =1a(1) =5a(2) =19a(3) =25a(4) =199a(5) =625a(6) =1999a(7) =2102a(8) =5582a(9) =9376a(10) =9909a(11) =10100a(12) =16833a(13) =19999a(14) =41012a(15) =55741a(16) =74491a(17) =83885a(18) =88102a(19) =90625a(20) =151774a(21) =199999a(22) =201002a(23) =558257a(24) =626522a(25) =740312a(26) =798097a(27) =810062a(28) =890625a(29) =1001000

External references