2147516417domain: NAppears in sequencesa(n) = 2^(2^n - 1) + 2^(2^(n + 1) - 1) + 1.at n=4A119571a(n) is the least positive integer that differs (in absolute value) by an (n+1)-st power from the reverse of its binary representation.at n=13A278930a(n) = 2^(n - 1) * (2^n + 1) + 1.at n=16A281481