770977domain: NAppears in sequencesSort-then-add sequence: a(1) = 316, a(n+1) = a(n) + sort(a(n)).at n=24A033861Starting with a(0) = 1, smallest number k > a(n-1) such that, for all a(m) with m < n, k + a(m) is not squarefree.at n=21A080793