Showing posts with label positive integers. Show all posts
Showing posts with label positive integers. Show all posts
Saturday, July 23, 2011
Smallest positive integer
What is the smallest positive integer n such that n^2 and (n + 1)^2 both contain the digit 7 but (n + 2)^2 does not
Tuesday, July 19, 2011
How many positive integers
How many positive integers x are there such that 3x has 3 digits and 4x has four digits?
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