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bonanova
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Kudos to JC. ;)

Anyone care to give the rationale?

I tried to hint with the long form but you discounted it -

THIRTEEN - or 1

FOURTEEN - or 0

FIFTEEN - or 1

SIXTEEN - or 9

Im sure the penny will drop

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The english spelling of numbers contain Roman Numerals.
I see my hint was passed over - oh hum!

0. Because taking ALL the Roman Numerals in order does not produce a VALID Roman Numeral. IXIX is not a valid Roman Numeral.

18 = XVIII

9 = IX

99 = IC

Think of it as algebra, or a sum that requires soloution
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