80520

Appears in sequences

• Third elementary symmetric function of 3,4,...,n+4.at n=8A024184
• a(n) = n*(n^4-1)/2.at n=9A027484
• Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= n/2.at n=20A047167
• Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= (n-1)/2.at n=20A047178
• Distribution of maximum inversion table entry.at n=41A056151
• Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(n,4).at n=19A126958
• a(n) = (prime(n)^5 - prime(n))/2.at n=4A138424
• Positive integers that are square roots of products a*(a+d)*(a+2*d) with coprime a > 0, d >= 0.at n=18A284876