progs/collatz.scala
author Christian Urban <christian.urban@kcl.ac.uk>
Mon, 30 Aug 2021 15:50:27 +0100
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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def collatz(n: BigInt) : Boolean = {
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  if (n == 1) true else 
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  if (n % 2 == 0) collatz(n / 2) else 
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  collatz(3 * n + 1)
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}