Your list "targets" contains some values twice. >>> targets=[97,101,139,41,37,31,29,89,23,19,8,13,131,19,73,97,19,139,79,67,61,17,113,127] >>> for t in set(targets): ... if targets.count(t) > 1: print t ... 97 139 19
It looks like the "duplicated" items in the output contain one of the duplicated items from the input. Jeff
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