9700000

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 3, 4, 7 and 9.at n=31A136934
• Numbers k such that k and k^2 use only the digits 0, 4, 5, 7 and 9.at n=40A136952
• Numbers k such that k and k^2 use only the digits 0, 4, 7 and 9.at n=23A136960
• a(n) = 1, 7, A011557*(period 6: repeat 10, 13, 31, 49, 70, 97).at n=37A178508