Finally, someone ranked the cool kids of number theory! The S-tier primes (2, 3, 7, 23, 83) are the mathematical equivalent of sitting at the popular lunch table. Meanwhile, poor 91 is that kid who desperately tries to fit in but everyone knows is just 7×13 in a trench coat. Notice how single-digit primes mostly get VIP treatment, while larger primes are relegated to the mathematical basement. This is peak number elitism - the smaller your digits, the cooler you apparently are. Next thing you know, mathematicians will be giving these numbers their own Instagram accounts and tracking which ones get the most followers. "Oh, you like 61? That's so D-tier of you."