A116310 n times n+5 gives the concatenation of two numbers m and m+3.
2, 4, 88, 3676, 6320, 8786, 48743, 51253, 87617, 3762554, 6237442, 9217100, 3266298274, 3520463764, 6479536232, 6733701722, 8063694648, 8317860138, 4689524709430934474, 5310475290569065522, 7416797436703661747
Offset: 1