摘要：
一、DescriptionMost positive integers may be written as a sum of a sequence of at least two consecutive positive integers. For instance,6 = 1 + 2 + 39 =... 阅读全文
摘要：
一、DescriptionThe digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that ... 阅读全文