424446485domain: NAppears in sequencesa(n) = next substring in concatenation of even numbers with length n (incl. leading zeros).at n=8A066555Floor of concatenation of n, n+1, n+2, n+3, n+4 divided by 5.at n=21A074995Concatenation of (5n-4), (5n-3), (5n-2), (5n-1) and 5n divided by 5.at n=4A082253