406351

Appears in sequences

• 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=20A068821
• Smallest triangular number beginning with the n-th triangular number other than itself.at n=27A072517
• Triangular numbers whose binary conversion, read in decimal, is prime.at n=26A227028
• Smallest triangular numbers whose decimal expansion begins (nontrivially) with n-th triangular number.at n=27A229235
• Smallest triangular number whose decimal expansion ends (nontrivially) with the n-th triangular number.at n=25A229262