%I #19 Apr 20 2024 02:08:10
%S 1,49,576,5804,42764,262818
%N Number of eleven-prime Carmichael numbers less than 10^n.
%H Claude Goutier, <a href="http://www-labs.iro.umontreal.ca/~goutier/OEIS/A055553/">Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22</a>.
%H Claude Goutier, <a href="/A055553/a055553.txt">Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22</a>. [Local copy, with permission]
%H Richard Pinch, <a href="http://www.s369624816.websitehome.co.uk/rgep/cartable.html">Tables relating to Carmichael numbers</a>.
%e 60977817398996785 = 5*7*17*19*23*37*53*73*79*89*233 is the only Carmichael number with eleven prime factors below 10^17, so a(17) = 1.
%Y For k-prime Carmichael numbers up to 10^n for k = 3,4,...,11, see A132195, A174612, A174613, A174614, A174615, A174616, A174617, A299710, A299711.
%Y Cf. A002997, A006931, A055553.
%K nonn,more,hard
%O 17,2
%A _Tim Johannes Ohrtmann_, Feb 17 2018
%E a(22) from _Claude Goutier_ added by _Amiram Eldar_, Apr 19 2024