378015

Appears in sequences

• a(n) = n^4 - (n-1)^4 + (n-2)^4 - ... 0^4.at n=29A062392
• Doubly hexagonal numbers.at n=15A063249
• Triangular numbers such that both the number formed by the first floor((k+1)/2) digits and the remaining part (if any) are triangular numbers, where k is the number of digits.at n=19A068821
• Smallest triangular number beginning with the n-th triangular number other than itself.at n=26A072517