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Carnevale della Matematica <a href="#65</a>" target="_blank">http://friendfeed.com/sea... ;, o 5512, o 1018, o 10014, o 10000012, o LXV, o 5×13, o 12+82, o 42+72, o O5, o anche 15+24+33+42+51. - <a rel="nofollow" href="http://proooof.blogspot.c... ; title="http://proooof.blogspot.c... ;