A116262 n times n+6 gives the concatenation of two numbers m and m-4.
42, 53, 38160, 61835, 83615, 346977, 653018, 950048, 8647552, 9534262, 8167822280, 9007920989, 9209900789, 9950000498, 4737445289218, 4990568257184, 5009431742811, 5262554710777, 8373808925582
Offset: 1