When arranging the natural numbers in a spiral and emphasizing the prime numbers, an intriguing and not fully explained pattern is observed, called the **Ulam spiral**.

**SB: crislemon | TumblrAB: [COLIN] (fascinating, thank you!) **

When arranging the natural numbers in a spiral and emphasizing the prime numbers, an intriguing and not fully explained pattern is observed, called the **Ulam spiral**.

**SB: crislemon | TumblrAB: [COLIN] (fascinating, thank you!) **

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