👉 "Marchman" is a concept in mathematics that refers to a sequence of integers which are all multiples of 3, but not necessarily all even. The concept was introduced by mathematician Richard A. Whittaker and his colleague, John H. Conway in their book "The Book of Numbers." The term is also used informally in the context of computer programming and algorithms where it refers to a sequence that satisfies certain conditions, such as being a palindrome or having all even numbers. In mathematics