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on hailstoneSequence(n)
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script o
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property sequence : {n}
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end script
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repeat until (n = 1)
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if (n mod 2 is 0) then
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set n to n div 2
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else
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set n to 3 * n + 1
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end if
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set end of o's sequence to n
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end repeat
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return o's sequence
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end hailstoneSequence
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set n to 27
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tell hailstoneSequence(n)
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return {n:n, |length of sequence|:(its length), |first 4 numbers|:items 1 thru 4, |last 4 numbers|:items -4 thru -1}
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end tell
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-- Number(s) below 100,000 giving the longest sequence length, using the hailstoneSequence(n) handler above.
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set nums to {}
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set longestLength to 1
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repeat with n from 2 to 99999
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set thisLength to (count hailstoneSequence(n))
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if (thisLength < longestLength) then
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else if (thisLength > longestLength) then
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set nums to {n}
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set longestLength to thisLength
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else
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set end of nums to n
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end if
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end repeat
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