668304000
domain: N
Appears in sequences
- Numbers k such that gcd(sigma(k),k) = k/5.at n=31A067237
- a(n) = Product_{i=0..n-1} (8*i+2).at n=7A084948
- Triangle read by rows: t(n,m)=If[m == 0, 1, Product[m*k + 2, {k, 0, n}]].at n=42A153190
- Numbers k for which sigma(k)/k - 4/5 is an integer.at n=5A218427
- Smallest x such that sigma(x)/x = 2*sigma(n)/n where sigma(n) is the sum of divisors of n.at n=29A246827
- a(n) = (2*n)!/(n!*a(n-1)), with a(0)=1.at n=13A372987
- Numbers k that have a record number of common divisors with sigma(k).at n=18A378267