81400

Appears in sequences

• Number of sublattices of index n in generic 4-dimensional lattice.at n=42A038991
• a(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3.at n=13A131991
• The Wiener index of the P_3 X P_n grid, where P_m is the path graph on m nodes. The Wiener index of a connected graph is the sum of distances between all unordered pairs of nodes in the graph.at n=36A180569
• a(n) = (43^n - 1)/42.at n=4A218746
• Totient numbers (A002202) of the form 1 + k + k^2 + k^3 +...+ k^i (i > 1, k > 1).at n=21A282090
• The sum of divisors of the smallest cubefull number that is a multiple of n.at n=42A369720
• The sum of divisors of the smallest cubefull exponentially odd number that is divisible by n.at n=42A369758
• The sum of the divisors of the smallest cube divisible by n.at n=42A390663