711914domain: NAppears in sequencesa(n) = n^5 - n^4 + n^3 - n^2 + n - 1.at n=15A062159Numbers whose set of base 15 digits is {0,E}, where E base 15 = 14 base 10.at n=21A097261a(n) = (15^n - (-1)^n)/16.at n=6A239284