555555555

Appears in sequences

• a(n) = 5*(10^n - 1)/9.at n=9A002279
• a(n) = floor(10^10/n).at n=17A057072
• Worthless numbers: numbers without h, o, r, t, or w.at n=17A073419
• Smallest multiple of n using only digits 0 and 5.at n=8A078244
• Integer part of the arithmetic mean of all the distinct numbers formed by permuting the digits of concatenation of numbers from 1 to n.at n=8A078266
• a(n) = A084006(n)^(1/2).at n=25A084007
• a(n) is the least positive integer in base 10 containing n fives that is divisible by n.at n=8A112900
• a(n) = 111111111 * n.at n=4A172525
• A109613(n)-fold concatenation of A008619(n).at n=8A180115
• In base 10 lunar arithmetic, a(n) is the smallest number than has exactly n different square roots (or -1 if no such number exists).at n=5A202174
• Expansion of x*(1 + 5*x + 40*x^2)/((1 - x^2)*(1 - 10*x^2)).at n=18A322927
• Repdigits which are also Harshad numbers.at n=22A377228
• Repdigit self-numbers that are not in A337208.at n=9A382167