5555556

Appears in sequences

• Kaprekar numbers: numbers k such that k = q + r and k^2 = q*10^m + r, for some m >= 1, q >= 0 and 0 <= r < 10^m. Here q and r must both have the same number of digits.at n=35A045913
• Find smallest pair (x,y) such that x^2 - y^2 = 11...1 (n times) = (10^n-1)/9; sequence gives value of x.at n=13A048611
• Index numbers for palindromic hexagonal numbers.at n=21A054970
• Expansion of g.f. (1-5*x)/((1-x)*(1-10*x)).at n=7A093142
• Number of (n+1) X (2+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction.at n=10A250749
• a(n) = decimal expansion of (n-1) prepended n times to the decimal expansion of n (n > 0).at n=5A267327
• 7-Kaprekar numbers.at n=5A333133
• Kaprekar numbers (A006886) that are divisible by the sum of their digits.at n=24A382165