1+11+111+1111+11111+111111+1111111+11111111+111111111 = ?

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Calculations

1. 1+11=12


2. 1+11+111=123


3. 1+11+111+1111=1234


4. 1+11+111+1111+11111=12345


5. 1+11+111+1111+11111+111111=123456


6. 1+11+111+1111+11111+111111+1111111=1234567


7. 1+11+111+1111+11111+111111+1111111+11111111=12345678


8. 1+11+111+1111+11111+111111+1111111+11111111+111111111=123456789

Pattern Observed

• Up to 8 terms → the result is just the sequence of digits 12345678 (and then 123456789).


• At 9 terms → instead of 123456789, it becomes 1234567901 (a little twist in the pattern).