Pisano period: Difference between revisions

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@@ Line 425: / Line 425: @@
     var (a, b, n) = (0, 1, p**k)
-    for k in (1..Inf) {
+..Inf -> first_by {
         (a, b) = (b, (a+b) % n)
+        (a == 0) && (b == 1)
-        if ([a,b] == [0,1]) {
-            return k
-        }
     }
 }