Doctor Who - 42 Clip - Happy Primes

it's scary that i know this off by heart

"any number that reduces to one when you take the sum of the square of it's digits and continue iterating until it yeilds 1 is a happy number. Any number that doesn't, isn't. A happy prime is a number that's both happy and prime, now TYPE IT IN. I dunno, talk about dumbing down. Don't they teach recreational mathematics any more?"

^all from memory. ^ It was a sad year of complete obsession last year

Hi, from Master the Mainframe Part 2 Website.

hi master the mainframe :)

Loooove Doctor Who--and series three is my fav. Then two... brilliant!

Cool.

"Don't they teach recreational mathematics any more?"

:)

4 squared = 16
1 squared + 6 squared = 37
3 squared + 7 squared = 58
5 squared + 8 squared = 89
8 squared + 9 squared = 145
1 squared + 4 squared + 5 squared = 42
4 squared + 2 squared = 20
2 squared + 0 squared = 4!
Then the number is not happy! Numbers is this cycle or that get caught in it are not happy (this cycle is unique apart from 1 squared =1)

LOL..I love the "talk about dumbing down". This is one of my fav eps from this season

erm... wtf?

He he he. The doctor had a time lords upbringing. That included "Recreational Math" and playing around with massive amounts of radiation in the nursery. Back when he was a young child of 89.