Prime Curios!: 761

761
(another Prime Pages' Curiosity)

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A sequence of six 9's (known as the Feynman Point) begins immediately after the 761st decimal place of

. Nobel prize-winning physicist Richard Feynman expressed a wish to memorize the digits of

as far as that point so that when reciting them, he would be able to end with "... nine, nine, nine, nine, nine, nine, and so on."

761 = prime(761) - (7!₂ * 6!₂ * 1!₂). Note that 761 is the smallest prime with this property. [Firoozbakht]

761 = ((7!) + (6!) + (1!)) - ((7!₂) + (6!₂) + (1!₂))). Note that prime 761 is the only number with this property. [Firoozbakht]

The sum of all the prime numbers up to 79, and a prime itself.

To link to this page use http://primes.utm.edu/curios/page.php?number_id=871