317206

Appears in sequences

• Sequence of distinct least triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 0.at n=20A236415
• Numbers n with the property that the symmetric representation of sigma(n) has four parts, each of width one and two regions meet at the center of the Dyck path.at n=37A264104
• Triangular numbers that are the sum of two distinct nonzero triangular numbers in exactly two ways.at n=32A350368