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recaman←{⎕IO←0
genNext←{
R←⍵[N-1]-N←≢⍵
(R<0)∨(R∊⍵):⍵,⍵[N-1]+N
⍵,⍵[N-1]-N
}
⎕←'First 15: '
⎕←reca←(genNext⍣14),0
⎕←'First repetition: '
⎕←⊃⌽reca←genNext⍣{⍺≢∪⍺}⊢reca
⎕←'Length of sequence containing [0..1000]:'
⎕←≢reca←genNext⍣{(⍳1001)∧.∊⊂⍺}⊢reca