Prime Curios!: 52

52
(another Prime Pages' Curiosity)

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The number of 8-digit primes (on a calculator) that remain prime if viewed upside down, in a mirror, or upside down in a mirror. [Russo]

Mersenne wrongly thought 2^257-1 is prime. In fact, 52 is the smallest base b for which (b^257-1)/b-1 is actually prime.

52! + 52 + 1 is prime. Note that 52 is the (5-2)rd untouchable number. [Mojdeh]

The element with atomic number 52 (Tellurium) is the only one whose atomic weight's integer part is a Mersenne prime. [Wu]

52 = (5!*2!). [Firoozbakht]

(There is one curio for this number that has not yet been approved by an editor.)

To link to this page use http://primes.utm.edu/curios/page.php?number_id=490