# The Phone Number puzzle

**Published:** September 25, 2026
**Author:** 3Blue1Brown
**Source:** YouTube — Andrej Karpathy
**Language:** en-US
**HTML:** https://aiqazaqstan.com/en/articles/the-phone-number-puzzle

Here's a surprising fact. If you take your phone number, it's possible to find another whole number bigger than zero such that multiplying the two of these results in an even bigger number consisting of just ones and zeros. What's more, if your phone number happens to end with a…

> From the original source: **YouTube — Andrej Karpathy**
> [Read full article at YouTube — Andrej Karpathy](https://www.youtube.com/shorts/ausLKMojXaY)

**Tags:** #YouTube

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