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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
J. Brillhart, D. H. Lehmer and J. L. Selfridge, New primality criteria and factorizations of 2^m+-1, Math. Compl. 29 (1975) 620-647.
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
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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Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)