9901 (another Prime Pages' Curiosity)
 Curios: Curios Search:   Participate: GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits) Turn this prime number upside down to get the year of the Norman Conquest of England. Any 12-digit number that has three or four digits that repeat themselves throughout the number will have 9901 as a prime factor. [Schuler] 9901, 99990001, 999999000001, and 9999999900000001, are primes. [Avrutin] 9901 divides 111111111111111111111111. [Avrutin] The greatest prime factor of any 12-digit repdigit is 9901. [La Haye] A prime whose square (98029801) is the concatenation of two consecutive numbers in descending order. [Bopardikar] 9901=99^2+99^1+99^0. [Silva] The only known prime with reciprocal of period dozen. [Post] (There is one curio for this number that has not yet been approved by an editor.)   To link to this page use /curios/page.php?number_id=250 Prime Curios! © 2000-2019 (all rights reserved)  privacy statement   (This page was generated in 0.0107 seconds.)