Numbers k such that the square of k is the concatenation of two numbers m and 4*m.

Terms

a(0) =160378a(1) =169812a(2) =179246a(3) =188680a(4) =198114a(5) =207548a(6) =216982a(7) =226416a(8) =235850a(9) =245284a(10) =254718a(11) =264152a(12) =273586a(13) =283020a(14) =292454a(15) =301888a(16) =311322a(17) =320756a(18) =330190a(19) =339624a(20) =349058a(21) =358492a(22) =367926a(23) =377360a(24) =386794a(25) =396228a(26) =405662