4900000

Appears in sequences

• Numbers of form 7^i*10^j, with i, j >= 0.at n=33A025632
• a(n) = 1, 7, A011557*(period 6: repeat 10, 13, 31, 49, 70, 97).at n=35A178508
• Numbers k such that sum of digits of k^2 is 7.at n=33A262711
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having index change +-(.,.) 0,0 0,1 or 1,2.at n=33A264341
• Number of (6+1)X(n+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 0,1 or 1,2.at n=2A264346