78606

Appears in sequences

• Triangular numbers for which the sum of the digits is a cube.at n=26A117803
• a(n) = m*(m+1)/2, where m = floor(n^(3/2)).at n=53A185541
• Number of ways to choose two points on a centered hexagonal grid of size n.at n=11A241219
• Numbers k such that the symmetric representation of sigma(k) has only two parts and they meet at the center of the Dyck path.at n=19A262259
• Triangular numbers that are the sum of two distinct nonzero triangular numbers in exactly two ways.at n=20A350368