The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #16 Apr 03 2023 10:36:13
%S 2,3,5,7,25,19,20,42,96,190,134,164,650,852,1455,2765,2480,3960,5464,
%T 6694,17206,13118,13680,28481,27445,28821,101696,116232,142083,187376,
%U 250118,1200007
%N Smallest number k >= A000043(n) such that k*A000668(n)*(k*A000668(n)+1)-1 is prime.
%C a(34) = 1200007.
%C A000043(34) = 756839.
%C A000668(34) = 2^756839-1.
%C 1200007*(2^756839-1)*(1200007*(2^756839-1)+1)-1 is a 455675 digits certified prime using PFGW.
%H Chris K. Caldwell, The List of Largest Known Primes, <a href="https://t5k.org/primes/page.php?id=118696">Prime corresponding to a(34)</a>
%Y Cf. A000043, A000668, A137908, A137909.
%K nonn
%O 1,1
%A _Pierre CAMI_, Oct 30 2014