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Proposal: merge gcd and lcm We tend to combine homologus objects into one tag, like supremum-and-infimum, limsup-and-liminf and even-and-odd-functions. It's well known that $ab = \gcd(a,b) \times \mathrm{lcm}(a,b)$, so knowing the gcd implies the same for lcm, and vice versa. The majority of lcm questions are also tagged with gcd.


No. If they want to talk about truncatable primes or russian doll primes, we have the prime numbers tag. Number of such concatenations, combinatorics. Use in code: programming, or computer algebra systems (or computer science stack exchange). They are already separated by type, in the tags used ( questionable if correctly however).

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