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A247260
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Numbers n such that 5*6^n + 1 is prime.
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5
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1, 2, 4, 17, 136, 147, 203, 590, 754, 964, 970, 1847, 2031, 2727, 2871, 5442, 7035, 7266, 11230, 23307, 27795, 34152, 42614, 127206, 133086
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OFFSET
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1,2
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COMMENTS
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a(26) > 2*10^5.
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[5*6^n + 1], Print[n]], {n, 0, 200000}]
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PROG
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(PARI)
for(n=0, 2*10^5, if(ispseudoprime(5*6^n+1), print1(n, ", "))) \\ Derek Orr, Sep 10 2014
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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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STATUS
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approved
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