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A275783
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Numbers n such that 10^n + 9^(n+1) is prime.
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0
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2, 3, 6, 11, 44, 64, 83, 123, 166, 381, 446, 1221, 1540, 3156, 5117, 5476, 6291, 6353, 13053, 15158, 23904, 78288, 82254, 91230
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OFFSET
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1,1
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COMMENTS
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a(25) > 10^5.
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LINKS
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EXAMPLE
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3 is a member since 10^3 + 9^4 = 1000 + 6561 = 7561 which is a prime number.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[10^# + 9^(# + 1)] &]
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PROG
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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