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Search: id:A152097
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| A152097 |
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Least k(n) such that 3*2^k(n)*M(n)-1 or 3*2^k(n)*M(n)+1 is prime (or both primes) with M(i)=i-th Mersenne prime |
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+0
1
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| 1, 1, 2, 1, 3, 2, 1, 5, 6, 9, 31, 44, 18, 71, 81, 1097, 64, 789, 42, 17, 908, 722, 1500, 1496, 5690, 6720, 3340, 18768, 9597, 13835
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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These are certified primes using PFGW from Primeform group
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EXAMPLE
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3*2^1*(2^2-1)-1=17 prime as 19 so k(1)=1 as M(1)=2^2-1 3*2^1*(2^3-1)-1=41 prime as 43 so k(2)=1 as M(2)=2^3-1 3*2^2*(2^5-1)+1=373 prime so k(3)=2 as M(3)=2^5-1
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CROSSREFS
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Cf. A145983.
Sequence in context: A131345 A134423 A061260 this_sequence A119442 A064861 A070979
Adjacent sequences: A152094 A152095 A152096 this_sequence A152098 A152099 A152100
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KEYWORD
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more,nonn
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AUTHOR
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Pierre CAMI (pierre-cami(AT)orange.fr), Nov 24 2008
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