Iterated digits squaring
If you add the square of the digits of a Natural number (an integer bigger than zero), you always end with either 1 or 89:
15 -> 26 -> 40 -> 16 -> 37 -> 58 -> 89 7 -> 49 -> 97 -> 130 -> 10 -> 1
Test
{{test}}Console output
If you add the square of the digits of a Natural number (an integer bigger than zero), you always end with either 1 or 89:
15 -> 26 -> 40 -> 16 -> 37 -> 58 -> 89 7 -> 49 -> 97 -> 130 -> 10 -> 1
Use Cmd instead of Ctrl if you're on a Mac.
| g | Focus editor |
| Ctrl-Enter | Run the test with current code |
| Ctrl-Shift-K | Reset the editor |
| Ctrl-Shift-L | Clear console output |
| Ctrl-Shift-X | Show the solution |
| [ | Previous challenge |
| ] | Next challenge |
| T | Back to top page |
| ? | Show this dialog |
| ESC | Hide this dialog |
| Shift-ESC | Blur focus from editor |