22906579627domain: NAppears in sequencesZsigmondy numbers for a = 4, b = 1: Zs(n, 4, 1) is the greatest divisor of 4^n - 1^n (A024036) that is relatively prime to 4^m - 1^m for all positive integers m < n.at n=26A064080a(n) = (1^n + (-2)^n + 4^n)/3.at n=18A245489