Number magic
Today I was going through ‘ Youtube.com ’ when I found this amazing channel about numbers ' numberpile ', I liked almost all videos in that channel but the most favorite one, was about the number ' 6174 '. '6174' and '495' are two of my favorite numbers. Why? Because of its property, Step one: Take any 4 digit number let’s say '6354' Step two: sort it in descending and assign it to 'a' So, a = 6543 Step three: sort it in ascending and assign it to 'b' So, b = 3456 Step four: (a-b) and assign to a So, a = 3087 Repeat: a = 8730 b = 0378 (a-b) = 8352 Repeat: a = 8532 b = 2358 (a-b) = 6174 Repeat: a = 7641 b = 1467 (a-b) = 6174 The number is '6174' and '495' is called 'Kaprekar's constant' as this was discovered by a Indian mathematician D. R. Kaprekar , '495' is for all three digit numbers. Cool, isn’t it!