Sad Number Checker
Check if a number is a sad number. A sad number never reaches 1 when repeatedly summing the squares of its digits — it enters an infinite cycle.
Is Sad Number?
Yes
4 is a sad number (enters a cycle, never reaches 1)
Sequence
4 → 16 → 37 → 58 → 89 → 145 → 42 → 20 → 4
Steps Before Cycle / End
8.00