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Old 2015-11-26, 13:10   #30
Ale
 

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But if now *3* get *5* , the number 13 is right

<*7*8*9*3*8*9*11*12*5*2*4*5*6*7*5*11*12*13
%373 = 18663872040715067857413241620994090598400000000000
(14:05) gp > isprime(%-1)
%374 = 1
(14:05) gp >
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