Moreover, every sequence with the first element has a multiplicative inverse. In that case, for every and are coprime, and so and are relatively prime. Therefore, each has an inverse , and the sequence of these inverses, , is the sought inverse of . For example, consider the -adic integer corresponding to the natural number 7; as a 2-adic number, it would be written (1, 3, 7, 7, 7, 7, 7, ...). This object's inverse would be written as an ever-increasing sequence that begins (1, 3, 7, 7, 23, 55, 55, 183, 439, 439, 1463 ...). Naturally, this 2-adic integer has no corresponding natural number.