547581

Appears in sequences

• Triangular numbers whose digit reversal is also a triangular number.at n=27A061455
• Non-palindromic triangular numbers whose reverse is a triangular number with the same number of digits.at n=5A066528
• Triangular numbers whose reverse is also triangular.at n=18A066569
• Nonpalindromic triangular numbers whose digit reversal is also a triangular number (possibly with fewer digits).at n=13A069673