33620

Appears in sequences

• a(n) = n*(n+1)^2/2.at n=40A006002
• a(n) = n*(2*n+1)^2.at n=20A084367
• Group the natural numbers such that the n-th group sum is divisible by the n-th triangular number: (1), (2, 3, 4), (5, 6, 7), (8, 9, 10, 11, 12), (13, 14, 15, 16, 17), (18, 19, 20, 21, 22, 23, 24), ... Sequence contains the group sum.at n=39A086500
• Number of edges in LCM of graphs K_n and C_4.at n=40A098585
• Minimal m > 0 such that Fibonacci(m) == 0 (mod n^3).at n=40A132633
• a(n) = (p^3 - p^2)/2, where p = prime(n).at n=12A138416
• Numbers n such that phi(n)/n = 16/41.at n=15A176598
• Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to n-2.at n=38A180292
• a(n) = 20*n^2.at n=41A195322
• a(n) = n^2 * floor(n/2).at n=41A265645
• Practical numbers z such that z^2 = x^2 + y^2 for some practical numbers x and y with gcd(x,y,z) = 4.at n=44A294112
• a(n) = n^2*(2*n - 3 - (-1)^n)/4.at n=40A303692
• Number of spanning trees of the graph acquired by placing a vertex in each of the n^2 cells of a triangle of size n in a triangular grid and placing edges between two vertices whenever two cells share a side.at n=4A351888
• a(n) = (-1)^n * n*(n + 1)*(2*n + (-1)^n * (4*n + 5) + 1) / 12.at n=40A368047
• Sum of squares of the multiplicities of pairwise distances among the vertices of a regular n-gon.at n=38A387858