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 2020-07-07, 16:12 #441 Viliam Furik   Jul 2018 Martin, Slovakia 3348 Posts k=20020913 tested up to n=500000 I have tested k=20020913 and found these primes: Code: 20020913*2^12-1 20020913*2^14-1 20020913*2^22-1 20020913*2^62-1 20020913*2^72-1 20020913*2^76-1 20020913*2^78-1 20020913*2^88-1 20020913*2^94-1 20020913*2^112-1 20020913*2^120-1 20020913*2^204-1 20020913*2^462-1 20020913*2^1214-1 20020913*2^1798-1 20020913*2^2022-1 20020913*2^3256-1 20020913*2^6406-1 20020913*2^8548-1 20020913*2^18088-1 20020913*2^62416-1 20020913*2^111300-1 20020913*2^162118-1 20020913*2^230406-1 20020913*2^240084-1 20020913*2^316934-1
 2020-09-04, 07:59 #442 Nescro   Jun 2020 22 Posts k=3382599 I have now searched k=3382599 from n=250k to n=500k. Primes: 3382599*2^263753-1 3382599*2^273764-1 3382599*2^283188-1 3382599*2^347133-1 3382599*2^376247-1 3382599*2^381211-1 3382599*2^496591-1

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