202
This number is a composite.
Just showing those entries submitted by 'Trotter': (Click here to show all)
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]
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