72426

Appears in sequences

• Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.at n=49A137094
• Numbers n such that the decimal expansions of both n and n^2 have 2 as smallest digit and 7 as largest digit.at n=29A257123
• Triangle read by rows, T(n, k) = S(k, n) with S(n, n) = 1, S(0, n) = 0 and otherwise S(k,n) = Sum_{i=1..n-k+1} k^i*S(k-1, n-i), for n>=0 and 0<=k<=n.at n=42A269955