Given that they speak of "evil numbers", I think it is reasonable to assume that the Shamans did not understand how the algorithm works. The inventor may have, but it seems likely that the users did not.

>Given that they speak of "evil numbers", I think it is reasonable to assume that the Shamans did not understand how the algorithm works.

Or maybe that the language translation is imprecise.

Wolfram has a definition of "evil numbers" here: http://mathworld.wolfram.com/EvilNumber.html which include "beastly evil numbers".

Also there are "apocalypse numbers" http://mathworld.wolfram.com/ApocalypseNumber.html , "beast numbers" http://mathworld.wolfram.com/BeastNumber.html , "leviathan numbers" http://mathworld.wolfram.com/LeviathanNumber.html , and "legion's numbers" http://mathworld.wolfram.com/LegionsNumbers.html among others.