424673280

Appears in sequences

• Product of totient function: a(n) = Product_{k=1..n} phi(k) (cf. A000010).at n=15A001088
• a(n) = Product_{k=1..n} d(k); d(k) = A000005(k) is the number of positive divisors of k.at n=19A066843
• a(n) = denominator(p(n, x)) / (n!*denominator(bernoulli(n, x))), where p(n, x) = Sum_{k=0..n} E2(n, k)*binomial(x + k, 2*n) / Product_{j=1..n} (j - x) and E2(n, k) are the second-order Eulerian numbers A201637.at n=21A341109
• a(n) = n*n! / Product_{k=1..n} radical(k), where radical(n) is the product of distinct prime factors of n, cf. A007947.at n=32A387151