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+ 6 is the smallest composite number whose sum of prime factors is prime. [Gupta]

+ The only perfect number that can be sandwiched between twin primes. [Gupta]

+ The product of the first four nonzero Fibonacci numbers. Note that 6 + 1 and 6 - 1 are twin primes. This is the smallest such product of consecutive nonzero Fibonacci numbers. [Gupta]




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