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    $\begingroup$ In the configuration displayed on Erich's page, the next digits are 739, so there is about $\frac34$ mm tolerance. This, all the other results and the code I used to find them may be viewed in the folder starting from here. $\endgroup$
    – Parcly Taxel
    Commented Jun 23, 2021 at 2:14
  • $\begingroup$ Also note that Erich's page indicates that this is apparently optimal, since the ratio for 22 circles is less than 4, though just barely. (Not sure if that's proven or just nobody's found a 22-circle solution yet?) $\endgroup$
    – Darrel Hoffman
    Commented Jun 23, 2021 at 13:28
  • $\begingroup$ Maybe you can apply this method to math.stackexchange.com/questions/556882/… $\endgroup$
    – RobPratt
    Commented Nov 10, 2021 at 23:16