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APL (Dyalog Classic), 31 bytes '#',{4=≢⍵:⍵[2 2 3 3 4 4]⋄6⍴1↓⍵} Try it online!

posted 3mo ago by Arpad Horvath‭ · edited 3mo ago by Arpad Horvath‭

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#2: Post edited by

Arpad Horvath‭ · 2025-01-27T16:44:04Z (3 months ago)

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# [APL (Dyalog Classic)], 31 bytes

'#',{4=≢⍵:⍵[2 2 3 3 4 4]⋄6⍴1↓⍵}
[Try it online!][TIO-m6fa255k]
[APL (Dyalog Classic)]: https://www.dyalog.com/
[TIO-m6fa255k]: https://tio.run/##SyzI0U2pTMzJT9dNzkksLs5M/v9fXVldp9rE9lHnoke9W62AONpIwUjBGAhNFExiH3W3mD3q3WL4qG0yUKr2f9qjtgkk6lBQV3Z0MjSysFTngrBhtDOUoQ4A "APL (Dyalog Classic) – Try It Online"

#1: Initial revision by

Arpad Horvath‭ · 2025-01-27T16:35:50Z (3 months ago)

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**APL** 46 bytes

    '#',{4=≢⍵:⍵[2 2 3 3 4 4]⋄6⍴1↓⍵}