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A059613
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Numbers k such that 5^k - 4 is prime.
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8
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5, 7, 15, 47, 81, 115, 267, 285, 7641, 19089, 25831, 32115, 59811, 70155, 178715
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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81 is present because 5^81 - 4 is prime.
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MATHEMATICA
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PROG
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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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