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576 = sigma(5*7*6). Note that 576 is the first multidigit
number with this property. [Firoozbakht]
A square equal to (2 + 3 + 5 + 7 + 11)^{2}  (2^{2} + 3^{2} + 5^{2} + 7^{2} + 11^{2}). It's the only such case for all primes < 2,000,000,000. [Trotter and De Geest]
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