# compute the primorial of n - the product of all primes <= n fn primorial(n) { return 2..(n+1) |? is_prime |// fn(x,y) { return x*y; }; } println(primorial(10)); # 2*3*5*7 = 210 println(primorial(20)); # 2*3*5*7*11*13*17*19 = 9699690