125526

Appears in sequences

• Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7.at n=54A137004
• Least integer m > 0 with pi(m*n) = sigma(m) + sigma(n), where pi(.) and sigma(.) are given by A000720 and A000203 respectively.at n=23A247673