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A145044
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Primes p (A000043) such that 2^p-1 is prime (A000668) and congruent to 271 mod 6!.
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4
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OFFSET
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1,1
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COMMENTS
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Mersenne numbers (with the exception of the first two) are congruent to 31, 127, 271, 607 mod 6!. This sequence is a subsequence of A000043.
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LINKS
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MATHEMATICA
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Select[MersennePrimeExponent[Range[47]], PowerMod[2, #, 6!] == 272 &] (* Amiram Eldar, Mar 22 2020 *)
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CROSSREFS
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Cf. A000043, A000668, A124477, A139484, A145038, A112633, A145041, A145042, A145044, A145045, A145046.
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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