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A176559
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The number of primes between two consecutive Mersenne primes.
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3
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OFFSET
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1,2
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LINKS
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G. L. Honaker, Jr. and C. Caldwell, 19, Prime Curios!.
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FORMULA
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EXAMPLE
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a(3) = 19 because between 3rd and fourth Mersenne primes (31 and 127) there are 19 primes (37, 41, 43, ... 113).
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,hard,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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