hard · GMAT Quant
For a positive integer k, define r(k) as the integer obtained by reversing the digits of k and dropping leading zeros. For example r(50)=5 and r(17)=71.
How many two-digit positive integers k satisfy k-r(k)=m^3 for some integer m?
- 14
- 18
- 22
- 26
- 30
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