487 (another Prime Pages' Curiosity)
 Curios: Curios Search:   Participate: A prime p such that the decimal fraction 1/p has the same period length as 1/p2. [Richter] 4872 divides 10486 - 1. 487 is the smallest prime p such that p and p3 have the same sum of digits. [Honaker] There are 487 Hadamard matrices of order 28. Note that 28 is a perfect number. [Rupinski] 487 = (4!2 + 8!2 + 7!2) - ((4) + (8) + (7)). Note that 487 is the smallest prime with this property. [Firoozbakht] Fermat claimed (correctly) that a number is the sum of three squares unless it is of the form 4n(8m + 7), with n,m greater than or equal to 0. 487 is the first prime after 3 that divides the periodic part of the decimal representation of its reciprocal. [Noe] The Demilitarized Zone (DMZ) is 487 square miles. The smallest of five consecutive full period primes (487, 491, 499, 503, 509). [Bowser] The smallest prime p such that all possible two-digit endings for prime numbers less than or equal to p occur at least once. [Honaker] (There are 2 curios for this number that have not yet been approved by an editor.) Prime Curios! © 2000-2018 (all rights reserved)  privacy statement