Numbers k which are concatenations k = x//y such that x^2 - y^2 is a multiple of k.

Terms

a(0) =147a(1) =528a(2) =729a(3) =1617a(4) =8019a(5) =13467a(6) =71289a(7) =91091a(8) =130896a(9) =310497a(10) =350268a(11) =970299a(12) =1010100a(13) =1016127a(14) =1034187a(15) =1140399a(16) =1190475a(17) =1216512a(18) =1300624a(19) =1334667a(20) =1360167a(21) =1416767a(22) =1484847a(23) =1530900a(24) =2020200a(25) =2032254a(26) =2068374a(27) =2280798