diff --git a/journal/2023-09-29.md b/journal/2023-09-29.md
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--- a/journal/2023-09-29.md
+++ b/journal/2023-09-29.md
@@ -1,8 +1,17 @@
 - [[29]] is [[drishti]] in the #Flancia [[Pattern Language]].
-- My hobby: think about whether numbers are prime.
-  - [[209]] is not prime; it is 19 * 11.
-    - I find this one quite beautiful as there are two simple "proofs" to get there:
+- My hobby, sometimes: think about whether numbers are prime while laying down or sitting.
+  - Take [[209]] -- it is not prime.
+    - I find this one quite beautiful, this is how I got 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.
+      - It is not a multiple of 7 because 210 is (as 21 is 3 * 7) and it's too near.
+      - Consider the hypothesis that it is multiple of 11.
+        - 220 is a multiple of 11.
+        - 220 - 11 is 209. 
+        - So 209 is a multiple of 11. What is the other factor?
+      - Consider the hypothesis that it is a multiple of 19.
+        - 19 * 10 is 190.
+        - 190 + 19 is 209 precisely, so it is a multiple.
+      - Therefore 209 is 11 * 19.
   - [[1547]] is not prime; it is 13 * 7 * 17.
+    - I don't remember how I got here but it was fun.