The sequence "123458" is a numerical string that consists of six digits. It is notable for being a simple, consecutive series of numbers with one digit missing, specifically the number 6. This pattern can be interesting in various contexts, such as coding, mathematics, or even puzzles. In mathematics, sequences like "123458" can be analyzed for patterns or used in algorithms. The absence of the digit 6 can lead to discussions about number properties, such as even and odd numbers, or the significance of missing elements in sequences.