9533

This number is a prime.

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9533 is just the sixth prime p for which p - ssd(p) = q^2, where q is prime and ssd(p) is the sum of the squared decimal digits of p. ssd(9533) = 81+25+9+9 = 124 and 9533-124 = 9409 = 97^2. The five smaller primes like this are 11, 2903, 3533, 3803, and 5197. [Keith]

Submitted: 2024-01-26 08:29:16;   Last Modified: 2024-01-26 12:09:31.
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