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 2019-09-20, 11:53 #1 enzocreti   Mar 2018 53910 Posts Probability to find a probable prime pg(215),pg(69660),pg(92020) and pg(541456) are prp... 215, 69660, 92020 and 541456 are 0 mod 43 and 10^m mod 41... i am trying to find the next pg(43s) probable prime and I am considering the multiples of 43 which are congruent to 1 mod 41 as 69660... a needle in the haystack do you think? Any trick to accelerate the search? Last fiddled with by enzocreti on 2019-09-20 at 11:56
 2019-09-20, 13:43 #2 enzocreti   Mar 2018 10338 Posts candidate A candidate is: (2^2234624-1)*10^672689+2^2234623-1, no factor upto 10^7
 2019-09-23, 06:13 #3 enzocreti   Mar 2018 72·11 Posts THE NUMBER IS NOT PRP Unfortunally the number is composite!

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