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A265121
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Integers k such that k*3^k + 2 is prime.
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1
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0, 1, 3, 5, 11, 15, 17, 153, 169, 273, 317, 373, 923, 1403, 1969, 2349, 7809, 10313, 12291, 24865, 41289
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OFFSET
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1,3
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COMMENTS
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Initial corresponding primes are 2, 5, 83 and 1217.
How do this sequence and A006552 compare asymptotically?
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LINKS
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EXAMPLE
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a(3) = 3 because 3^3 * 3 + 2 = 83 is prime.
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MATHEMATICA
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PROG
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(PARI) for(n=0, 1e6, if(ispseudoprime(3^n*n + 2), print1(n, ", ")));
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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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