A116344 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m+8.
464, 535, 717, 821, 3427, 6572, 90906, 980201, 3636360, 6363639, 41176467, 58823532, 413533837, 426573429, 428571425, 432620008, 567379991, 571428574, 573426570, 586466162, 686261110, 725274728, 727272724, 731321307
Offset: 1