4 ms·
That's much easier than the (separate) div 7 rule that this blog post links to: https://www.johndcook.com/blog/2010/10/27/divisibility-by-7/ https://www.johndc
by kzrdude 6y ago
That's much easier than the (separate) div 7 rule that this blog post links to: https://www.johndcook.com/blog/2010/10/27/divisibility-by-7/ https://www.johndcook.com/blog/2010/10/27/divisibility-by-7/
Maybe not mechanically easier, but easier to remember.