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2026-08-07 06:56:19 +00:00 · 2023-09-29 00:54:48 +02:00
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    - I find this one quite beautiful as there are two simple "proofs" to get there:
      - It is not multiple of two or five trivially.
      - It is not a multiple of three as its digits don't add up to a multiple.
+      - It is not a multiple of 7 as 210 is (as 21 is 3 * 7); and it's too near to it.
  - [[1547]] is not prime; it is 13 * 7 * 17.