01234567891011

01234567891011 is the string formed by concatenating the decimal representations of the non-negative integers from 0 through 11 inclusive. As such, it begins with the digits 0 through 9 in order, followed by the two-digit numbers 10 and 11, giving a total length of 14 digits.

In mathematical and computational contexts, this string serves as a simple example of a digit-concatenation sequence. It is used as a test input for algorithms that parse numbers from unseparated strings, or to illustrate how separators are needed to recover the original numbers. The digits 0–9 appear as single digits at the start, and the two-digit numbers 10 and 11 follow, occupying positions 11–12 and 13–14 respectively. The string thus forms a prefix of the broader idea of concatenating successive natural numbers in decimal notation, a concept that underlies various demonstrations of digit distribution and sequence generation.