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Old 2003-12-06, 13:59   #10
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13

113

113*2+1 =
227
is Prime

11113

111111113

111111113*2+1 =
222222227
is Prime

then

111111113*2+1

MILLER-RABIN PRIMALITY TEST


222222227 =
222222227
is Prime

...

strange


2*prime+1 - high probability its prime!
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