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I thought it was commonly believed that 7 is the most often picked - I've seen a "magic" trick based around that before.

Sort of looks to me like people avoid the extremes and also 5 (possibly because it's "right in the middle" and so perceived as "less random"?).

I didn't think that much. I just chose 7 because I wanted to choose I high number, but anything higher then 7 would have been to high.

I was talking with a friend when I visited the website, and just completely unconsciously entered any number. It was 7. After submitting I wondered why I did that without even thinking about it.

my favorite number is 4 but I entered 7 because I wanted something higher and this was the highest prime number within that range :)