Numbers k that are a substring of k*(k-1).

Terms

a(0) =2a(1) =11a(2) =50a(3) =52a(4) =69a(5) =101a(6) =250a(7) =252a(8) =500a(9) =502a(10) =685a(11) =750a(12) =752a(13) =1001a(14) =1250a(15) =3136a(16) =3752a(17) =5000a(18) =5002a(19) =6250a(20) =8752a(21) =10001a(22) =18752a(23) =31250a(24) =46329a(25) =50000a(26) =50002a(27) =68752a(28) =81250a(29) =84168