50250

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 6.at n=27A136911
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 8.at n=39A136913
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 9.at n=37A136914
• a(n) = 2*A276086(n) - A276086(A001065(n)), where A276086 is the primorial base exp-function, and A001065 is the sum of proper divisors of n.at n=56A379494