198. How many positive integers have the same digits in the same order when written in base 7
and in base 13?
200. If 2015 + a = b for positive integers a and b, both of which are palindromes, what is the
smallest possible value of a?
198. answer 6: namely 1, 2, 3, 4, 5,, 6
after that they become 10 (base 7) but 8 (base 13)
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