A happy number is any positive integer where if you progressively add the square of its digits and produce new numbers, and then repeat, you get 1. Other numbers are unhappy. Let’s try it for 2877290:
For 2877290, the sum of the digits squared is:
4 + 64 + 49 + 49 + 4 + 81 = 251 (thanks for Katrina for pointing out my maths mistake!!!)
Repeat for 251: 4 + 25 + 1 = 30
Repeating for 30 gives: 9 + 0 = 9
And so on, until it gets into an endless cycle. Therefore, 2877290 is not a happy number!!
You may think me completely insane, but it is true. Look it up. http://en.wikipedia.org/wiki/Happy_number
The Mahon Tribunal will not be finished until it has thoroughly uncovered the full mathematical truth behind the deposit of £28,772.90 into Celia’s account. It is certainly an unhappy number for Bertie.