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589407 (another Prime Pages' Curiosity) |
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589407 is the smallest number m such that the six numbers 1.prime(m).prime (m+1), prime (m).1.prime (m+1), prime (m).prime (m+1).1, 1.prime (m-1).prime (m), prime (m-1).1.prime (m), and prime (m-1).prime (m).1 (formed by concatenation) are primes. [Firoozbakht]
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