Hofstadter Figure-Figure sequences: Difference between revisions
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These two sequences of positive integers are defined as: |
These two sequences of positive integers are defined as: |
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:<math>\begin{align} |
:<math>\begin{align} |
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Sequence S starts: 2, 4, 5, 6, 8, ... |
Sequence S starts: 2, 4, 5, 6, 8, ... |
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Task: |
;Task: |
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# Create two functions named ffr and ffs that when given n return R(n) or S(n) respectively.<br><small>(Note that R(1) = 1 and S(1) = 2 to avoid off-by-one errors).</small> |
# Create two functions named ffr and ffs that when given n return R(n) or S(n) respectively.<br><small>(Note that R(1) = 1 and S(1) = 2 to avoid off-by-one errors).</small> |
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# No maximum value for n should be assumed. |
# No maximum value for n should be assumed. |
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* [http://mathworld.wolfram.com/HofstadterFigure-FigureSequence.html Wolfram Mathworld] |
* [http://mathworld.wolfram.com/HofstadterFigure-FigureSequence.html Wolfram Mathworld] |
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* Wikipedia: [[wp:Hofstadter_sequence#Hofstadter_Figure-Figure_sequences|Hofstadter Figure-Figure sequences]]. |
* Wikipedia: [[wp:Hofstadter_sequence#Hofstadter_Figure-Figure_sequences|Hofstadter Figure-Figure sequences]]. |
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<br><br> |
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=={{header|Ada}}== |
=={{header|Ada}}== |
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Specifying a package providing the functions FFR and FFS: |
Specifying a package providing the functions FFR and FFS: |
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