3243010

Appears in sequences

• a(n) is the index of the smallest triangular number containing exactly n 5's.at n=8A048360
• Irregular triangle read by rows: T(n,k) (0 <= k <= n^2) are coefficients of exact wrapping probability for site percolation on an n X n 2D triangular lattice with periodic boundary conditions. This is for the probability that it wraps in either dimension.at n=49A365953