@article{hrj:156,
    title      = {Carmichael number with three prime factors.},
    author     = {D R Heath-Brown},
    url        = {https://hrj.episciences.org/156},
    doi        = {10.46298/hrj.2007.156},
    journal    = {Hardy-Ramanujan Journal},
    issn       = {2804-7370},
    volume     = {Volume 30 - 2007},
    eid        = 1,
    year       = {2007},
    month      = {Jan},
    keywords   = {Ramanujan sum, Upper bound, Three prime factors, Carmichael numbers, [MATH]Mathematics [math]},
    language   = {English},
}