OFFSET
0,11
LINKS
Claude Goutier, Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22. [Local copy, with permission]
R. G. E. Pinch, The Carmichael numbers up to 10^21, Proceedings of Conference on Algorithmic Number Theory 2007.
EXAMPLE
The smallest Carmichael number with 7 prime factors is 5394826801 = 7*13*17*23*31*67*73, and there is one other 10-digit example, so a(10)=2.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Michel Lagneau, Mar 23 2010
EXTENSIONS
a(22) from Claude Goutier added by Amiram Eldar, Apr 19 2024
STATUS
approved