3822059520domain: NAppears in sequencesa(1) = 1, a(2) = (2*1)/1 = 2. a(n+1) = (n+1)*a(n) divided by the largest prime divisor of a(n).at n=26A100773Number of ways to place 7 nonattacking bishops on an n X n toroidal board.at n=11A178140Numerator of Product_{k=1..n-1} (1 + 1/prime(k)).at n=11A236435