Prime Curios!: 7669

7669
(another Prime Pages' Curiosity)

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David MacQuarrie's PrimeTimeClock will only display the time (as hours:minutes:seconds) if the corresponding number is prime. It displays 7669 different times each day and indicates whether a prime is special (e.g., a Sophie Germain prime) by illuminating its beacon in different colors.

The number of twin lucky numbers less than a million. [Schneider]

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