OFFSET
17,2
LINKS
Claude Goutier, Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22. [Local copy, with permission]
Richard Pinch, Tables relating to Carmichael numbers.
EXAMPLE
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.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Tim Johannes Ohrtmann, Feb 17 2018
EXTENSIONS
a(22) from Claude Goutier added by Amiram Eldar, Apr 19 2024
STATUS
approved