7529535domain: NAppears in sequencesa(n) = n^phi(n) - 1.at n=13A066916a(n) = n^6 - 1.at n=13A123866Number of 7-bead necklaces of n colors allowing reversal, with no adjacent beads having the same color.at n=14A208545Odd numbers that are one less than the square of a perfect power.at n=34A389956