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Search: id:A096305
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| A096305 |
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Numbers n such that 7^n + 4 is prime. |
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+0
1
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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
(list; graph; listen)
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OFFSET
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1,3
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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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CROSSREFS
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Sequence in context: A035563 A028378 A143587 this_sequence A039888 A036959 A108031
Adjacent sequences: A096302 A096303 A096304 this_sequence A096306 A096307 A096308
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KEYWORD
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nonn
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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 (rshepherd2(AT)hotmail.com), Jun 29 2004
7 more terms from Jason Earls (zevi_35711(AT)yahoo.com), Feb 16 2008
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