378885

Appears in sequences

• Triangular numbers obtained as a concatenation of successive terms of A081847.at n=23A082235
• a(n) = n*(n+1)*(n^2+n+1)/2.at n=29A110450
• Smallest triangular numbers whose decimal expansion begins (nontrivially) with n-th triangular number.at n=26A229235
• Triangular numbers with strictly increasing product of digits.at n=31A246753