My user number
5770501 = 11 * 524591
524591both are Sophie Germain Primes.
13are twin primes.
524593also conform twin primes.
524591is a number that can not be written as a sum of 3 squares. But
11has a unique representation as a sum of 3 squares : 11 = 12 + 12 + 32.
11is a Lucas number but
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