A174614 Number of six-prime Carmichael numbers less than 10^n.

0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 99, 459, 1714, 5270, 14401, 36907, 86696, 194306, 414660, 849564, 1681744, 3230120, 6034046

Offset: 0

Author

Michel Lagneau, Mar 23 2010

Keywords

• nonn
• more

Examples

			For n=9: the smallest Carmichael number with 6 prime factors is 321197185 = 5*19*23*29*37*137.
		

References

• Paulo Ribenboim, The Little Book of Bigger Primes, Springer-Verlag NY 2004. See p. 220.

Links

• Claude Goutier, Text file readme.text summarizing enumeration of Carmichael numbers up to 10^22.
• 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.

Crossrefs

For k-prime Carmichael numbers up to 10^n for k = 3,4,...,11, see A132195, A174612, A174613, A174614, A174615, A174616, A174617, A299710, A299711.

Cf. A002997, A006931, A055553.

Extensions

a(22) from Claude Goutier added by Amiram Eldar, Apr 19 2024