74057domain: NAppears in sequencesa(n) = min { p +- q : p +- q > 1 and p*q = Product_{k=1..n-1} a(k) }.at n=10A003681a(n) = a(n-1) + a(n-2) + gcd(a(n-1), n), a(1) = a(2) = 1.at n=22A360884a(n) = floor(b(n)), where b(1) = 1 and b(n) = b(n-1) + Sum_{k=1..n-1} b(k)/(n-1).at n=48A376995