4545454

Appears in sequences

• Numbers k such that k^2 is a concatenation of two successive numbers.at n=9A030467
• a(n) = floor(10^8/n).at n=21A033424
• Numbers k of the form a - b + c, such that k^3 equals the decimal concatenation a//b//c and numbers k, b, and c have the same number of digits.at n=28A259379
• Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.at n=21A343536