630003

Appears in sequences

• Triangular numbers with every digit a triangular number.at n=24A062100
• 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=21A068821
• Smallest triangular number beginning with the n-th triangular number other than itself.at n=34A072517
• Triangular numbers using only the curved digits 0, 3, 6, 8 and 9.at n=24A079653
• a(n) = n*(n+1)*(n^2+n+1)/2.at n=33A110450
• Triangular numbers composed of digits {0,3,6}.at n=11A119063