Yet in an uncanny number of real-world data sets, an astonishing 30.1 percent of the entries begin with a 1, 17.6 percent begin with a 2, and so on. This phenomenon is known as Benford's law.

Learn what an arithmetic sequence is and about number patterns in arithmetic sequences with this BBC Bitesize Maths KS3 article. For students aged of 11 and 14.