My site has ONE backlink, yet it's PR3?

My case:
I have built website 3 months ago - only ONE article (very good SEO optimized, 500 words, ~1.2 kw density, one link to homepage).
I totally forgot about it and I see that now have PR3.

I has only 8 backlinks (from 2 different domains).

I believe it's because of good content. Any other thoughts?
 
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