# Self reference is a pain [duplicate]

How many letters do the answer of this puzzle contain?

NB: This came across while web surfing. I don't claim any ownership rights.

May be

four

Logic

None of the other digits expressed in words have appropriate word-length

• Interesting alternate answer would be 0. Sep 1 '17 at 6:21
• That is a good interesting deviation! Kudos Sep 1 '17 at 9:29

• any hint as to why?
– JMP
Sep 1 '17 at 7:11
• Just count the letters... Sep 1 '17 at 7:20

fourteen plus three

Which contains exactly

17 letters

• And seven plus seven, fifteen times one, one followed by six, etc. Sep 1 '17 at 12:48

4 (Four)

Reason

it is the only number that contains the same number of letters to spell it. This speaks to the title, as it is self referential.

It is

21, as the number of letters in