202

This number is a composite.

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A semiprime 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]

Submitted: 2001-12-01 20:19:39; Last Modified: 2022-11-27 03:11:50.