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)

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up