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A174616 Number of eight-prime Carmichael numbers less than 10^n. 9
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 89, 655, 3622, 16348, 63635, 223997, 720406, 2148017, 6015901 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,13

LINKS

Table of n, a(n) for n=0..21.

R. G. E. Pinch, "The Carmichael numbers up to 10^21", Proceedings of Conference on Algorithmic Number Theory 2007

EXAMPLE

The smallest Carmichael number with 8 prime factors is 232250619601 = 7*11*13*17*31*37*73*163, and there are 6 others, so a(12) = 7.

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: A036902 A142204 A071363 * A089394 A068692 A178006

Adjacent sequences:  A174613 A174614 A174615 * A174617 A174618 A174619

KEYWORD

nonn,more

AUTHOR

Michel Lagneau, Mar 23 2010

STATUS

approved

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Last modified September 28 04:28 EDT 2022. Contains 357063 sequences. (Running on oeis4.)