124025

Appears in sequences

• Structured rhombic triacontahedral numbers (vertex structure 11).at n=24A100164
• Wiener index of a benzenoid consisting of a double-step zig-zag chain of n hexagons (n >= 2, s = 2123; see the Gutman et al. reference).at n=26A193395
• Numbers k such that the sum of divisors of k (A000203) and the sum of proper divisors of k (A001065) are both triangular numbers (A000217).at n=9A329704