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A090649
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Numbers k such that 9^k + 2 is prime.
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12
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0, 1, 2, 4, 5, 7, 12, 13, 18, 49, 55, 63, 193, 247, 610, 929, 2173, 3479, 5494, 11158, 16754, 30920, 47752, 50702, 53725, 68122, 89214, 180804
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OFFSET
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1,3
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COMMENTS
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LINKS
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EXAMPLE
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9^13 + 2 = 2541865828331 is prime, so 13 is a term.
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MATHEMATICA
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PROG
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(PARI) for(i=0, 700, if(isprime(9^i+2), print(i)))
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net), Feb 02 2004
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EXTENSIONS
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More terms from mohammed bouayoun (bouyao(AT)wanadoo.fr), Feb 04 2004
Removal of erroneous term (97715) by Robert Price, Aug 19 2014
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STATUS
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approved
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