From f9cd77b43afebce15a1a72173a3275a9020e3a5c Mon Sep 17 00:00:00 2001
From: Marek Paśnikowski <marek@marekpasnikowski.pl>
Date: Sun, 14 Jan 2024 11:23:24 +0100
Subject: Return to the proper triangular number formula

---
 org-fc-algo-tn.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/org-fc-algo-tn.el b/org-fc-algo-tn.el
index 90b5419..b6a23b5 100644
--- a/org-fc-algo-tn.el
+++ b/org-fc-algo-tn.el
@@ -6,7 +6,7 @@
   "The mathematical formula for the Nth triangular number."
   (if (zerop n)
       0
-    (/ (* n (1+ n)) 4.0)))
+    (/ (* n (1+ n)) 2.0)))
 
 (defun org-fc-algo-tn-next-parameters (ease box interval rating)
   "Calculate the next parameters of a card, based on the review RATING.
-- 
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