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28 (another Prime Pages' Curiosity) |
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times on that day (and possibly the next). (caldwell@utm.edu) The second perfect number. Leonhard Euler (1707--1783) proved that all even Perfect numbers are of the form 2n-1(2n - 1) where 2n - 1 is a Mersenne prime Mn. (28#)2 + 29 are consecutive primes. [Luhn] 28 is a perfect number expressible as the sum of first five prime numbers i.e., 2 + 3 + 5 + 7 + 11 = 28. [Gupta] The number of Hadamard matrices of order 28 is prime. [Rupinski] The 28th Fibonacci number plus and minus 28 is prime, i.e., F(28)-28 and F(28)+28 are primes. [Opao] The 28th Fibonacci number plus 2828 is prime. This is the largest such number less than a thousand. [Opao]
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