From c3a85f5ba1597b319379099210a1bb3528b85ef3 Mon Sep 17 00:00:00 2001
From: Flancian <0@flancia.org>
Date: Fri, 29 Sep 2023 00:54:12 +0200
Subject: [PATCH] autopushed

---
 journal/2023-09-29.md | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/journal/2023-09-29.md b/journal/2023-09-29.md
index 658c265ea..bcaabdf69 100644
--- a/journal/2023-09-29.md
+++ b/journal/2023-09-29.md
@@ -1,2 +1,7 @@
 - [[29]] is [[drishti]] in the #Flancia [[Pattern Language]].
-- [[209]] is not prime; it is 19 * 11.
+- 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:
+      - 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.
+  - [[1547]] is not prime; it is 13 * 7 * 17.