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#10 by Alois P. Heinz at Sat Jul 29 22:37:19 EDT 2023
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#9 by Jon Grantham at Sat Jul 29 22:14:06 EDT 2023
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#8 by Jon Grantham at Sat Jul 29 22:14:00 EDT 2023
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| DATA
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3, 5, 7, 4703, 30113, 835391
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| LINKS
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Jon Grantham and Andrew Granville, <a href="https://arxiv.org/abs/2307.07894">Fibonacci primes, primes of the form 2^n-k and beyond</a>, arXiv:2307.07894 [math.NT], 2023.
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| EXTENSIONS
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a(6) from Jon Grantham, Jul 29 2023
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| STATUS
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approved
editing
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#7 by N. J. A. Sloane at Fri May 27 07:27:38 EDT 2016
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#6 by Tim Johannes Ohrtmann at Mon May 23 03:04:15 EDT 2016
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#5 by Johannes W. Meijer at Sat May 21 19:31:36 EDT 2016
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#4 by G. C. Greubel at Sat May 21 02:27:50 EDT 2016
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#3 by Tim Johannes Ohrtmann at Fri May 13 05:21:53 EDT 2016
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#2 by Tim Johannes Ohrtmann at Fri May 13 05:14:51 EDT 2016
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| NAME
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allocatedNumbers n forsuch Timthat (9^n - 7^n)/2 Johannesis Ohrtmannprime.
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| DATA
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3, 5, 7, 4703, 30113
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| OFFSET
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1,1
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| COMMENTS
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All terms are prime.
The corresponding primes: 193, 21121, 1979713, ...
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| MATHEMATICA
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Select[Range[1, 10000], PrimeQ[(9^# - 7^#)/2] &]
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| PROG
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(PARI) for(n=1, 10000, if(isprime((9^n - 7^n)/2), print1(n, ", ")))
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| CROSSREFS
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Cf. A173718, A128346, A059803.
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| KEYWORD
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allocated
nonn,more,hard
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| AUTHOR
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Tim Johannes Ohrtmann, May 13 2016
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| STATUS
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approved
editing
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#1 by Tim Johannes Ohrtmann at Fri May 13 05:14:51 EDT 2016
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| NAME
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allocated for Tim Johannes Ohrtmann
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| KEYWORD
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allocated
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| STATUS
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approved
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