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A120120
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Number of n-digit prime quadruplets.
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3
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1, 3, 7, 26, 128, 733, 3869, 23620, 152141, 1028789, 7188960, 51672312, 381226246, 2873279651
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OFFSET
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2,2
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LINKS
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EXAMPLE
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a(3) = 3 because there are three three-digit prime quadruples: {101, 103, 107, 109}, {191, 193, 197, 199} and {821, 823, 827, 829}.
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CROSSREFS
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KEYWORD
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nonn,more,base
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AUTHOR
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Julien Peter Benney (jpbenney(AT)ftml.net), Aug 15 2006, Aug 19 2006
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EXTENSIONS
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STATUS
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approved
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