A116315 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m+4.
3, 6, 44, 55, 38162, 61837, 83617, 346979, 653020, 950050, 8647554, 9534264, 8167822282, 9007920991, 9209900791, 9950000500, 4737445289220, 4990568257186, 5009431742813, 5262554710779, 8373808925584
Offset: 1