this post was submitted on 08 Jan 2025
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[–] Prime_Minister_Keyes@lemm.ee 23 points 1 day ago (2 children)

Well, on the surface, it's just 60-3, so clearly divisible by 3 itself. Now 221, that's some fuckery.

[–] Alenalda@lemmy.world 4 points 16 hours ago

When I was young I learned that when you add up all the numbers if that number is a multiple of 3 than the original number is also divisible by 3. So 51, 5+1=6 and 6 divisible by 3 and so must 51.

[–] lennivelkant@discuss.tchncs.de 2 points 20 hours ago

Dammit, it was right in the post, why did that take me so long?