3

This number is a prime.

Just showing those entries submitted by 'Green': (Click here to show all)

Jason Funk © 2002
+ Divisibility test for 3: A number is divisible by 3 if the sum of its digits is divisible by 3. (The same is true for nine.) [Greene]

+ The only prime number adjacent to a prime number in any row of Pascal's Triangle. [Green]

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