90250
domain: N
Appears in sequences
- The Wiener index of the straight pentachain of n pentagonal rings (see Fig. 2.1 in the A. A. Ali et al. reference).at n=35A224459
- a(n) = n^2*(n*(4*n + 3) + 3*n*(-1)^n - 4)/96.at n=37A302758
- Numbers m such that sigma(sigma(m))/m is a square.at n=39A318084
- Expansion of Sum_{k>=1} (-1 + Product_{j>=1} (1 + x^(k*j))/(1 - x^(k*j))).at n=28A320942