Sum of digits of a square number. – math.stackexchange.com 12:52 Posted by Unknown No Comments A positive integer n is said to be good if there exists a perfect square whose sum of digits in base 10 is equal to n. For instance, 13 is good because (7^2)=49 and 4+9=13. How many good numbers are ... from Hot Questions - Stack Exchange OnStackOverflow via Blogspot Share this Unknown
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