216135domain: NAppears in sequencesa(n) = n^7 - (n-1)^7 + (n-2)^7 - ... + ((-1)^n)*0^7.at n=6A152726Numbers n such that (n + digit sum of n) and (n + digit product of n) are nontrivial permutations of the digits of n.at n=18A246421