[quote="jolly_roger" of number 17 is surprisingly widespread in Italy.
All to do with roman numerals and roman graves. (I think)[/quote]
It's to do with Roman numerals. The Roman numeral for 17 is XVII. Rearranging the letters spells VIXI which in Latin means "I have lived". Or in other terms "My life is over" or "I am dead".
It's not uncommon to find Tall buildings in Italy don't have a 17th floor. Hotels don't have a room 17. Alitalia Airline planes do not have a seat 17. Also Renault sold its R17 model as R177 in Italy.