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GnumbersMonday, February 8, 2016. Primes and quadratic involving deduction of 2. Take a prime p and double it then deduct 5 to obtain 2p5. Candidate = -2 p*2p5. Example p=53 so 2p5 =101. Next try p=47 so 2p5 = 89. Next try p=59 so 2p5 = 113. Next try p=61 so 2p5 = 117. Next try 67 so 2p5 = 129. Now algebraically we might say -2 p*(2p-5) which is rewritten 2p 2-5p-2. Next try 71 so 2p5 = 137. Next try 73 so 2p5 = 141. Next try 79 so 2p5 = 153. Next try 83 so 2p5 = 161. Next try 89 so 2p5 = 173. 221 = p*(p 4).
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