10101010101

10101010101 is an eleven-character binary string consisting of alternating ones and zeros, starting with 1.

In binary notation it represents the integer 1365 (2^10 + 2^8 + 2^6 + 2^4 + 2^2 + 2^0). In hexadecimal, the same value is 0x555. The pattern is the alternating-bit sequence 0101… when viewed in larger groupings, and the 11-bit version is a subset of that broader idea.

The pattern is a classic example of an alternating-bit sequence. Such patterns are used in digital electronics and memory testing because they toggle every line, helping to reveal faults such as stuck-at values and to stress-test data buses.

The 11-bit string is related to the wider family of alternating patterns, including 0x5555 for 16-bit words and 0x555 for smaller groupings. These patterns appear in testing, calibration, and demonstrations of bitwise operations, as they provide simple yet informative signals about circuit behavior.

Apart from technical contexts, 10101010101 may appear in puzzles or demonstrations of binary arithmetic. It is primarily notable as a binary number with a regular alternating bit pattern, rather than for any special mathematical property beyond its representation and use in digital contexts.