55050030

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 3, 5, 8 and 9.at n=40A136941
• Number of ways we can write [n] as the union of 2 sets of sizes i, j which intersect in exactly 2 elements (2 < i,j < n; i = j allowed).at n=17A348257