8729721

Appears in sequences

• n-phi-torial, or phi-torial of n: Product k, 1 <= k <= n, k relatively prime to n.at n=19A001783
• Smallest number of the form n*k + 1 that is divisible by all the phi(n) numbers less than n and relatively prime to n.at n=18A084715
• Terms of A001783 which are smaller than the preceding term in that sequence.at n=7A193340
• Product of positive odd integers smaller than n and relatively prime to n.at n=19A209388
• The Gauss factorial n_10!.at n=19A232984
• The Gauss factorial n_10!.at n=20A232984
• a(n) is the least integer that can be expressed as the difference of two heptagonal numbers in exactly n ways.at n=24A334036
• Numbers k such that k * gcd(sigma(k), A003961(k)) is equal to the odd part of {sigma(k) * gcd(k, A003961(k))}, where A003961 shifts the prime factorization one step towards larger primes, and sigma is the sum of divisors function.at n=12A349169
• a(n) is the product of the first n odd numbers not divisible by 5.at n=8A358990