A metadrome is a number whose hexadecimal digits are in strict ascending order. The first few are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, ... (OEIS A023784). A number that is not a metadrome is a nialpdrome. The following table summarized related classes of numbers. name | base-16 digit order katadrome | strict descending metadrome | strict ascending nialpdrome | nonincreasing plaindrome | nondecreasing

digit | hexadecimal | katadrome | nialpdrome | plaindrome