2985972domain: NAppears in sequencesa(n) = n^6 - n.at n=12A131473Numbers that can be represented as a sum of a square of a prime and a cube of a prime in more than one way.at n=20A196752Numbers that can be represented in more than one way as p^r + q^s with 4 distinct primes p < q, r, s.at n=29A390178