as/for a curiosity

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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!