Humans tend to be biased towards 47 as well. It’s almost halfway between 1 and 100 and prime so you’ll find people picking it when they have to choose a random number.

Then there’s the whole Pomona College thing https://en.wikipedia.org/wiki/47_(number)

The whole blue 7 thing [1] and variations is very fascinating, but we don't tend to repeatedly pick the same number in the same exact context, though. That's what made this stand out to me - I had a document where Claude had picked 47 for "random" things dozens of times.

[1] https://en.wikipedia.org/wiki/Blue%E2%80%93seven_phenomenon

I experienced this even second hand when a coworker excitedly told of an encounter with a cold reader, and I knew the answer would be blue 7 before he told me what his guess was. Just his recap of the conversation was enough.

I am biased towards 67

Funny, I didn't know there were 10 years old on hacker news!

The thirteen-year-olds are biased towards 69.

Maybe Claude is just a fan of Alias.

I just asked GPT 5.5 Thinking to choose any random 2 digit number. The result was indeed 47. Interesting.

Gemini gave 42