28629121domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = n^5-n+1.at n=31A272162Primes of the form k^5-k+1.at n=11A338893a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} n/gcd(x_1, x_2, x_3, x_4, n).at n=30A372961Prime numbersat n=1778147