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Message boards : PrimeSearchTeam message board : Primes formed by concatenating two neighbour Mersenne number in base ten

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paolo
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Message 130073 - Posted: 2 Jun 2019 | 6:32:40 UTC

https://mathoverflow.net/questions/294527/are-concatenations-of-two-consecutive-mersenne-numbers-which-are-congruent-to-6

https://mathoverflow.net/questions/321020/probable-primes-of-a

I found primes of this type up to k=4*10^5. Can you help me to go further at least up to k=10^6? These primes are formed by concatenating in decreasing order two consecutive Mersenne numbers eg 255127, 12763, 40952047. No prime of this form congruent to 6 mod 7 was found up to k=800.000.

Message boards : PrimeSearchTeam message board : Primes formed by concatenating two neighbour Mersenne number in base ten

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