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 A273517 Numbers k such that 2*14^k-1 is prime. 1
 4, 10, 124, 550, 4720, 14644, 23896, 83384, 95492 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(10) > 10^5. - Tyler NeSmith, May 11 2021 LINKS Table of n, a(n) for n=1..9. J. Brillhart, D. H. Lehmer and J. L. Selfridge, New primality criteria and factorizations of 2^m+-1, Math. Compl. 29 (1975) 620-647. John Eisenmann, Prime Numbers of the Form a * 14^b - 1. Victor Shoup, A Computational Introduction to Number Theory and Algebra, 2008, page 348. Eric Weisstein's World of Mathematics, Lucas Sequence. Eric Weisstein's World of Mathematics, Rabin-Miller Strong Pseudoprime Test. MATHEMATICA Select[Range[0, 15000], PrimeQ[2 14^# - 1] &] (* Vincenzo Librandi, May 24 2016 *) PROG (PARI) is(n)=ispseudoprime(2*14^n-1) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Sequence in context: A203224 A198156 A347818 * A370687 A003086 A102958 Adjacent sequences: A273514 A273515 A273516 * A273518 A273519 A273520 KEYWORD nonn,more AUTHOR Jack P. Eisenmann, May 23 2016 EXTENSIONS a(7)-a(9) from Tyler NeSmith, May 11 2021 STATUS approved

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