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A prime p such that the decimal fraction 1/p has the same period length as 1/p^{2}. [Richter] 487^{2} divides 10^{486}  1. 487 is the smallest prime p such that p and p^{3} 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 4^{n}(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 twodigit endings for prime numbers less than or equal to p occur at least once. [Honaker]
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