508536

Appears in sequences

• a(1) = 0, then smallest triangular number such that a(n+1)- a(n) is a palindrome.at n=39A075057
• Triangular numbers such that the binary representation is of the form either Tbt or Tt, where T and t are binary representations of triangular numbers with equal binary length, and b is a binary digit: b = 1 or 0.at n=11A226736
• Triangular numbers such that the three numbers before it and the three numbers after it are squarefree.at n=26A374393