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A174612
Number of four-prime Carmichael numbers less than 10^n.
9
0, 0, 0, 0, 0, 4, 19, 55, 144, 314, 619, 1179, 2102, 3639, 6042, 9938, 16202, 25758, 40685, 63343, 98253, 151566, 232742
OFFSET
0,6
LINKS
EXAMPLE
For n=5, the smallest Carmichael number with 4 prime factors is 41041 = 7*11*13*41.
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.
Sequence in context: A122684 A122681 A215862 * A020496 A108484 A283333
KEYWORD
nonn,more
AUTHOR
Michel Lagneau, Mar 23 2010
EXTENSIONS
a(0) inserted and a(22) from Claude Goutier added by Amiram Eldar, Apr 19 2024
STATUS
approved