

A174617


Number of nineprime Carmichael numbers less than 10^n.


5



0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 27, 170, 1436, 8835, 44993, 196391, 762963, 2714473
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OFFSET

0,15


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

n=13, with 9 prime factors, the smallest Carmichael number is : 9746347772161 = 7*11*13*17*19*31*37*41*641.


CROSSREFS

Cf. A002997, A132195, A006931, A055553, A174612  A174616.
Sequence in context: A042418 A042420 A213285 * A055339 A248234 A083560
Adjacent sequences: A174614 A174615 A174616 * A174618 A174619 A174620


KEYWORD

nonn


AUTHOR

Michel Lagneau, Mar 23 2010


STATUS

approved



