202

This number is a composite.

+ A semi-prime palindrome equal to (2 + 3 + 5 + 7)2 - (22 + 32 + 52 + 72). It's the only such case for all primes < 2,000,000,000. [Trotter and De Geest]

+ 202^293 begins with the digits 293 (a prime). Note that 293^202 begins with the digits 202 (a palindrome). [Hartley]

(There are 2 curios for this number that have not yet been approved by an editor.)

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