The pattern 8 5 4 9 1 7 6 3 2 0 is an alphabetical pattern in which the numbers, when written out in letters, are listed in alphabetical order. The solution is found by listing the pattern as eight, five, four, nine, one, seven, six, three, two and zero.
This pattern of numbers is an example of a non-mathematical sequence. Another type of similar sequence is 7, 8, 5, 5, 3, 4 and so forth, in which the numbers indicate the number of letters in each month of the year, and the order places them in chronological order. The sequence 31, 28, 31, 30 and so forth lists the number of days in each month in chronological order.