8910720

Appears in sequences

• Product of 6 consecutive integers.at n=17A053625
• a(n) = smallest m such that sigma(m) = (n+1/2)*m.at n=3A088912
• a(n) = (n-1)*(n-2)*...*(n-r) with the least value of r so that n divides a(n).at n=12A092914
• Numbers n such that sigma(n)/n = 9/2.at n=0A141645
• Numbers m with half-integral abundancy index, sigma(m)/m = k+1/2 with integer k.at n=5A159907
• a(n) = v(n+1)/v(n), where v=A203472.at n=5A203473
• Numbers n such that gcd(sigma(n), n) > gcd(sigma(m), m) for all m < n.at n=20A216793
• Numbers n with the property that, if tau(n) = k = number of divisors of n, and the d(i) are the divisors [arranged in increasing order], then the sum 1/d(k) + 1/d(k-1) + 1/d(k-2) + ... + 1/d(q) is an integer for some q.at n=22A226476
• Numbers n such that antisigma(n) mod n = 0, where antisigma(n) = A024816(n) = sum of numbers less than n which do not divide n.at n=6A242484
• Numbers k that divide 2*sigma(k).at n=16A246454
• Smallest x such that sigma(x)/x = 2*sigma(n)/n where sigma(n) is the sum of divisors of n.at n=39A246827
• Numbers k such that k divides lcm(tau(k), sigma(k)).at n=27A307740
• a(n) = smallest m such that sigma(m) = n*m/2.at n=7A317681
• Numbers with a record number of divisors that have the same value of the Euler totient function (A000010).at n=15A328857
• Indices k of records of low value in the ratios A319696(k)/A000005(k) between the number of distinct values of the Euler totient function applied to the divisors of k and the number of divisors of k.at n=22A328859
• a(n) = (n + A332558(n))!/(n-1)!.at n=11A332560
• Numbers k for which A065330(k) = A065330(sigma(k)).at n=34A336458
• Numbers whose numerator and denominator of the harmonic mean of their divisors are both 3-smooth numbers.at n=28A348867
• a(n) = RisingFactorial(2*n, n) = A124320(2*n, n).at n=6A352601
• a(n) is the least number k such that A373531(k) = n, or -1 if no such k exists.at n=19A373532