Prime Curios!: 661

661
(another Prime Pages' Curiosity)

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661 is the start of a record-breaking twin prime gap.

Lord Kelvin, one of Britain's great physicists, published 661 papers on a wide range of scientific subjects. [Rosen]

The smallest prime that becomes reversible (emirp) when turned upside-down (199). [Beedassy]

To link to this page use http://primes.utm.edu/curios/page.php?number_id=304