Geodesic
Carmichael numbers of the form \((6m+1)(12m+1)(18m+1)\)
Journal of integer sequences, Tome 5 (2002) no. 2
Numbers of the form $(6m+1)(12m+1)(18m+1)$ where all three factors are simultaneously prime are the best known examples of Carmichael numbers. In this paper we tabulate the counts of such numbers up to $10^n$ for each $n\le 42$. We also derive a function for estimating these counts that is remarkably accurate.
Classification : 11A99
Keywords: Carmichael numbers (Concerned with sequence 
@article{JIS_2002__5_2_a5,
     author = {Dubner,  Harvey},
     title = {Carmichael numbers of the form \((6m+1)(12m+1)(18m+1)\)},
     journal = {Journal of integer sequences},
     year = {2002},
     volume = {5},
     number = {2},
     zbl = {1020.11005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2002__5_2_a5/}
}
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%A Dubner,  Harvey
%T Carmichael numbers of the form \((6m+1)(12m+1)(18m+1)\)
%J Journal of integer sequences
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Dubner,  Harvey. Carmichael numbers of the form \((6m+1)(12m+1)(18m+1)\). Journal of integer sequences, Tome 5 (2002) no. 2. http://geodesic.mathdoc.fr/item/JIS_2002__5_2_a5/