A116343 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+8.
14, 86, 76983, 714690, 952314, 90438191, 96320544, 32980078899029, 34346653774238, 42816188292273, 42881990066488, 57118009933512, 57183811707727, 65653346225762, 67019921100971, 81321742742210
Offset: 1
Examples
96320544 * 96320545 = 92776472//92776480, where // denotes concatenation.