173641

Appears in sequences

• 4-dimensional pyramidal numbers: a(n) = n^2*(n^2-1)/12.at n=38A002415
• a(n) = n^2 * (4*n^2 - 1) / 3.at n=19A187756
• Number of (n+3) X 4 0..2 matrices with each 4 X 4 subblock idempotent.at n=14A224721
• Number of orbits of Aut(Z^7) as function of the infinity norm n of the representative lattice point of the orbit, when the cardinality of the orbit is equal to 80640.at n=39A266396
• Odd numbers k such that k divides A005940(k).at n=26A364545
• Integers k such that k^2 can be written as the sum of three positive fourth powers.at n=25A365657