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A299711
Number of eleven-prime Carmichael numbers less than 10^n.
9
1, 49, 576, 5804, 42764, 262818
OFFSET
17,2
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
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: A110203 A263704 A166832 * A175775 A215117 A350982
KEYWORD
nonn,more,hard
AUTHOR
EXTENSIONS
a(22) from Claude Goutier added by Amiram Eldar, Apr 19 2024
STATUS
approved