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Hofstadter Figure-Figure sequences: Difference between revisions
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{{task}}
These two sequences of positive integers are defined as:
:<math>\begin{align}
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Sequence S starts: 2, 4, 5, 6, 8, ...
;Task:
# 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>
# No maximum value for n should be assumed.
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* [http://mathworld.wolfram.com/HofstadterFigure-FigureSequence.html Wolfram Mathworld]
* Wikipedia: [[wp:Hofstadter_sequence#Hofstadter_Figure-Figure_sequences|Hofstadter Figure-Figure sequences]].
<br><br>
=={{header|Ada}}==
Specifying a package providing the functions FFR and FFS:
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