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Carmichael numbers (A002997) that are overpseudoprimes to base 2 (A141232).
1

%I #33 Apr 22 2024 08:12:26

%S 65700513721,168003672409,459814831561,13685652197857,34477679139751,

%T 74031531351121,92327722290241,206175669172201,704077371354601,

%U 1882982959757929,2901482064497017,3715607011189609,5516564718607489,5636724028491697,6137426373439681,14987802403246609

%N Carmichael numbers (A002997) that are overpseudoprimes to base 2 (A141232).

%C If we define f(n) to be the smallest number in the sequence with n prime factors, then we have:

%C f(3) = 65700513721,

%C f(4) <= 84286331493236478328609,

%C f(5) <= 3848515708338676403444146123852434164444641.

%H Amiram Eldar, <a href="/A352987/b352987.txt">Table of n, a(n) for n = 1..450</a> (calculated using data from Claude Goutier; terms 1..102 from Daniel Suteu)

%H Claude Goutier, <a href="http://www-labs.iro.umontreal.ca/~goutier/OEIS/A055553/">Compressed text file carm10e22.gz containing all the Carmichael numbers up to 10^22</a>.

%H <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers</a>.

%Y Intersection of A002997 and A141232.

%Y Intersection of A291637 and A141232.

%K nonn

%O 1,1

%A _Daniel Suteu_, May 06 2022