Hofstadter Figure-Figure sequences: Difference between revisions

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m (J: cleaner efficiency implementation)
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=={{header|J}}==
=={{header|J}}==


<lang j>R=:_1 1 3 7
<lang j>R=:_1 1 3
S=:0 2 4 5
S=:0 2 4
FF=:3 :0
FF=:3 :0
while.+./y>:R,&#S do.
while.+./y>:R,&#S do.