Difference between revisions of "1994 AHSME Problems/Problem 21"
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Revision as of 22:08, 27 June 2014
Problem
Find the number of counter examples to the statement:
![\[``\text{If N is an odd positive integer the sum of whose digits is 4 and none of whose digits is 0, then N is prime}."\]](http://latex.artofproblemsolving.com/1/f/2/1f2899a28449ee41ee276d1f4e6e9c3f284d3f0b.png)
