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A084125
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Numbers n such that 13*3^n + 2 is prime.
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0
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1, 3, 6, 7, 11, 29, 106, 111, 138, 966, 1203, 2719, 3357, 11445, 15066, 16837, 36750
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OFFSET
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1,2
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COMMENTS
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Values corresponding to 29, 106, 111, 138, 966, 1203 and 2719 (1299 digits) have been certified prime with Primo. 13*3^3357 + 2 is a probable prime. There are no other terms <= 6000.
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LINKS
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EXAMPLE
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Primes 41,353,9479,28433 are 13*3^1+2, 13*3^3+2, 13*3^6+2, 13*3^7+2.
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MATHEMATICA
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Select[Range[1000], PrimeQ[13 * 3^# + 2] &] (* Amiram Eldar, Sep 11 2019 *)
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PROG
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(PARI) for(n=1, 6000, if(isprime(13*3^n+2), print1(n, ", ")))
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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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EXTENSIONS
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11445 (a pseudoprime) from Huseyin Azoguz (huseyin(AT)mmnetz.de), Nov 30 2008
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STATUS
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approved
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