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 A174612 Number of four-prime Carmichael numbers less than 10^n. 9
 0, 0, 0, 0, 4, 19, 55, 144, 314, 619, 1179, 2102, 3639, 6042, 9938, 16202, 25758, 40685, 63343, 98253, 151566 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS R. G. E. Pinch, "The Carmichael numbers up to 10^21", Proceedings of Conference on Algorithmic Number Theory 2007 EXAMPLE 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. Cf. A002997, A006931, A055553. Sequence in context: A122684 A122681 A215862 * A020496 A108484 A283333 Adjacent sequences:  A174609 A174610 A174611 * A174613 A174614 A174615 KEYWORD nonn,changed AUTHOR Michel Lagneau, Mar 23 2010 STATUS approved

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)