Happy prime: Difference between revisions
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According to the [[Tenth Doctor]], a '''happy prime''' was any number which was both happy and [[prime number|prime]]. He went on to describe a [[happy number]]: | According to the [[Tenth Doctor]], a '''happy prime''' was any number which was both happy and [[prime number|prime]]. He went on to describe a [[happy number]]: | ||
{{quote|Any number that reduces to | {{quote|Any number that reduces to [[1 (number)|1]] when you take the [[sum]] of the [[square (algebra)|square]] of its [[digit]]s and continue iterating it until it yields 1 is a happy number; any number that doesn't, isn't.||42 (TV story)}} | ||
When the [[SS Pentallian|SS ''Pentallian'']] hurtled towards the [[Torajii]] sun, [[Riley Vashtee]] and [[Martha Jones]] used the happy prime sequence of 313, 331, 367 and 379 to reach the ship's back-up engines, with help from the Tenth Doctor. | When the [[SS Pentallian|SS ''Pentallian'']] hurtled towards the [[Torajii]] [[sun]], [[Riley Vashtee]] and [[Martha Jones]] used the happy prime sequence of [[313 (number)|313]], [[331 (number)|331]], [[367 (number)|367]] and [[379 (number)|379]] to reach the ship's back-up engines, with help from the Tenth Doctor. | ||
The Doctor bemoaned Riley and Martha's lack of knowledge about happy primes and wondered why there appeared to be falling standards in the education of | The Doctor bemoaned Riley and Martha's lack of knowledge about happy primes, and wondered why there appeared to be falling standards in the education of [[recreational mathematics]]. ([[TV]]: ''[[42 (TV story)|42]]'') | ||
[[Category:Happy primes| *]] | |||
[[Category:Mathematics from the real world]] | [[Category:Mathematics from the real world]] | ||
[[Category:Prime numbers]] | |||
Latest revision as of 16:53, 21 October 2024
According to the Tenth Doctor, a happy prime was any number which was both happy and prime. He went on to describe a happy number:
Any number that reduces to 1 when you take the sum of the square of its digits and continue iterating it until it yields 1 is a happy number; any number that doesn't, isn't.
When the SS Pentallian hurtled towards the Torajii sun, Riley Vashtee and Martha Jones used the happy prime sequence of 313, 331, 367 and 379 to reach the ship's back-up engines, with help from the Tenth Doctor.
The Doctor bemoaned Riley and Martha's lack of knowledge about happy primes, and wondered why there appeared to be falling standards in the education of recreational mathematics. (TV: 42)
