Asked • 06/26/19

Digit-increasing number test?

A number is called digit-increasing if it is equal n + nn + nnn + ... for some digit n between 1 and 9. For example 24 is digit-increasing because it equals 2 + 22 (here n = 2). Actually, a friend of mine asked me this question and i am stuck thinking about it but couldn't find the exact solution so far. Can anyone help ? I needed the function that returns true if it is digit-increasing else false.

3 Answers By Expert Tutors


Patrick B.

so then there are only 10 such sequences: 1 + 11+111+1111+ .... 2 +22+222+2222.... etc


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