145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145.
Find the sum of all numbers which are equal to the sum of the factorial of their digits.
Note: as 1! = 1 and 2! = 2 are not sums they are not included.
puts (0..50000).select{|i|
i.to_s.length>1 && i == i.to_s.each_char.map{|d| (1..d.to_i).reduce(1,:*)}.reduce(:+)}.reduce(:+)版权声明：本文博客原创文章，博客，未经同意，不得转载。
projecteuler---->problem=34----Digit factorials
原文：http://www.cnblogs.com/bhlsheji/p/4746802.html