125751

Appears in sequences

• Triangular numbers that remain triangular when the least significant digit is moved to the beginning.at n=14A068071
• a(1) = 1, a(n+1) is the largest triangular number <= n*a(n).at n=9A077002
• Triangular numbers whose sum of squared digits is also triangular.at n=29A094890
• Triangular numbers composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}.at n=27A247021
• Numbers k such that (32*10^k - 77)/9 is prime.at n=23A290153