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A096305
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Numbers n such that 7^n + 4 is prime.
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11
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0, 1, 2, 3, 5, 7, 9, 14, 23, 129, 198, 235, 275, 630, 870, 1033, 1290, 3293, 3458, 11466, 13885, 25893, 32186, 33139, 58125, 78929, 97197, 121933, 128422, 442674
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..30.
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EXAMPLE
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7^14 + 4 = 678223072853 is a prime number.
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MATHEMATICA
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Do[If[PrimeQ[7^n+4], Print[n]], {n, 1, 1000}]
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PROG
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(PARI) for(n=0, 10^5, if(ispseudoprime(7^n+4), print1(n, ", "))) \\ Felix Fröhlich, Jun 04 2014
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CROSSREFS
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Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213.
Sequence in context: A028378 A325833 A143587 * A039888 A036959 A108031
Adjacent sequences: A096302 A096303 A096304 * A096306 A096307 A096308
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KEYWORD
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nonn,more,changed
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net), Jun 26 2004
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EXTENSIONS
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More terms (probable primes) from Rick L. Shepherd, Jun 29 2004
7 more terms from Jason Earls, Feb 16 2008
a(25)-a(27) from Robert Price, Jan 24 2014
a(28)-a(29) from Lelio R. Paula, Nov 2014
a(30) from Paul Bourdelais, Feb 11 2021
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STATUS
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approved
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