Carmichael Numbers of the form (6m + 1)(12m + 1)(18m + 1)

Harvey Dubner
2002 Journal of Integer Sequences   unpublished
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 ≤ 42. We also derive a function for estimating these counts that is remarkably accurate.
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