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A101234
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Numbers n such that 7^n+5^n-1 is prime.
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0
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1, 2, 3, 9, 13, 25, 26, 63, 73, 435, 2245, 2907, 3089, 5615
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OFFSET
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1,2
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COMMENTS
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Terms beyond 435 are (BSW-)pseudoprimes. - Joerg Arndt, Jan 25 2011
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LINKS
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Table of n, a(n) for n=1..14.
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PROG
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(MAGMA) [n: n in [0..400]|IsPrime(7^n+5^n-1)]
(PARI) for(n=1, 10000, if(isprime(7^n+5^n-1), print1(n, ", "))) /* Joerg Arndt, Jan 25 2011 */
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CROSSREFS
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Sequence in context: A032486 A123859 A048744 * A233190 A269154 A225792
Adjacent sequences: A101231 A101232 A101233 * A101235 A101236 A101237
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KEYWORD
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nonn,more
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AUTHOR
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Vincenzo Librandi, Jan 22 2011
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EXTENSIONS
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a(11)-a(13) from Joerg Arndt, Jan 25 2011
a(14) from Vincenzo Librandi, Jul 28 2020
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STATUS
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approved
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