Riley: Name the next number in this sequence; 313 331 367... What?
Martha: You said the crew knew all the answers.
Riley: The crew's changed since we set the questions!
Martha: You're joking!!
Doctor: It's 379.
Martha: What?
Doctor: It's a sequence of happy prime, 379.
Martha: Happy what?
Doctor: Just enter it.
Riley: Are you sure? We only get one chance.
Doctor: Any number that reduces to 1 when you take the sum of the square of its digits and continually reiterate until it yields 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 don't know, talk about dumbing down. Don't they teach recreational mathematics anymore?
Credit for images to doctorwho.time-and-space.co.uk screencaps - 42, Series 3
Credit for quotes to Addicted to Doctor Who Facebook Group
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