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Task/Happy-numbers/Phix/happy-numbers.phix

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+function is_happy(integer n)
+sequence seen = {}
+integer k
+    while n>1 do
+        seen &= n
+        k = 0
+        while n>0 do
+            k += power(remainder(n,10),2)
+            n = floor(n/10)
+        end while
+        n = k
+        if find(n,seen) then
+            return 0
+        end if
+    end while
+    return 1
+end function
+
+integer n = 1
+sequence s = {}
+while length(s)<8 do
+    if is_happy(n) then
+        s &= n
+    end if
+    n += 1
+end while
+?s