as/for a curiosity

[Over the top]

Hello
How to say "because of a curiosity" at beginning of a paragraph
Is this correct,
As a curiosity I looked it up at the book
for a curiosity I looked it up at the book

Thanks

 

[yuriya]

Hello
How to say "because of a curiosity" at beginning of a paragraph
Is this correct,
As a curiosity I looked it up at the book
for a curiosity I looked it up at the book

Thanks

(Just) Out of curiosity, I looked it up in the book.

Hope it helps!