steps

3n+1 Explorer

Type any number. Odd: triple it and add one. Even: halve it. Does it always fall to 4, 2, 1?

Pick a number

Speed

Race it against (up to 3)

Record hunt

Checks every start, one by one.

Your turn: Which number under a million climbs the highest? Post your record.

Share or take it home

One HTML file, no install. Space play/pause · R reset

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