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

0,10

Links

Table of n, a(n) for n=0..22.

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.

Example

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

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.

Sequence in context: A003206 A206257 A101376 * A099193 A086951 A041370

Adjacent sequences: A174611 A174612 A174613 * A174615 A174616 A174617

Keyword

nonn,more,changed

Author

Michel Lagneau, Mar 23 2010

Extensions

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

Status

approved