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A299711 Number of Carmichael numbers with eleven prime factors less than 10^n. 1
1, 49, 576, 5804, 42764 (list; graph; refs; listen; history; text; internal format)
OFFSET

17,2

LINKS

Table of n, a(n) for n=17..21.

Richard Pinch, Tables relating to Carmichael numbers.

EXAMPLE

60977817398996785 = 5*7*17*19*23*37*53*73*79*89*233 is the only Carmichael number with eleven prime factors below 10^17 so a(17) = 1.

CROSSREFS

Cf. A132195, A174612, A174613, A174614, A174615, A174616, A174617, A299710.

Sequence in context: A110203 A263704 A166832 * A175775 A215117 A289992

Adjacent sequences:  A299708 A299709 A299710 * A299712 A299713 A299714

KEYWORD

nonn,more,hard

AUTHOR

Tim Johannes Ohrtmann, Feb 17 2018

STATUS

approved

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Last modified June 25 04:25 EDT 2019. Contains 324346 sequences. (Running on oeis4.)