5576881domain: NPropertiesPrimalityPrimeyesAppears in sequencesDuodecimal primes: p = (x^12 + y^12 )/(x^4 + y^4 ).at n=10A006687Zsigmondy numbers for a = 7, b = 3: Zs(n, 7, 3) is the greatest divisor of 7^n - 3^n that is relatively prime to 7^m - 3^m for all positive integers m < n.at n=23A109348Prime numbersat n=385713