
Curios:
Curios Search:
Participate: 
Divide the prime number 431 by 510 to obtain an excellent approximation to log_{10}(7). [Kulsha] In addition to 431 and 433 being twin primes, both the 431st and the 433rd Fibonacci numbers are prime. [Dobb] Polaris (the North Star) is 431 lightyears from Earth, according to astrometric measurements of the Hipparcos satellite. n! is divisible by the sum of the decimal digits of n! for all numbers n from 1 to 431. Note that 431 is prime also. [Gupta] 2*3*5*...*prime(4311) = prime(431)1 (mod prime(431)). Note that 431 is the largest known prime with this property and there exist only one other known such prime. [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=975
Prime Curios! © 19992014 (all rights
reserved)
