Random challenges for InSim prizes

[Olli]

This challenge has expired. Winner: Nick

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Challenge: Find the missing Roman numeral (numbers 1-50).
I,II,III,IV,V,VI,VII,VIII,IX,X,XI,XII,XIII,XIV,XV,XVI,XVIII,XIX,XX,XXI,XXII,XXII​I,XXIV,
XXV,XXVI,XXVII,XVIII,XXIX,XXX,XXXI,XXXII,XXXIII,XXXIV,XXXV,XXXVI,XXXVII,XXXVIII,​XXXIX,XL,XLI,XLII,XLIII,XLIV,XLV,XLVI,XLVII,XLVIII,XLIX,L
Prize: 2000 euros
Rules: N/A
Their answer: XVII