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Velkommen til Helvede, fediversets hotteste instance! Vi er en queerfeministisk server, der shitposter i den 9. cirkel. Welcome to Hell, We’re a DK-based queerfeminist server. Read our server rules!

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What do they have in common?
6, 10, 14, 15, 21, 22, 26, 30, 33, 34, 35, 38, 39 ...

@futurebird Composite numbers where the prime factors appear only once? I.e 6 because 2x3 are both unique, but not twelve because in 2x2x3 2 appears twice?

@leoparddrengen

Exactly!

"the composite and square-free primes"