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9901 (another Prime Pages' Curiosity) |
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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]
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