Few more problems

problem_28.py

@@ -0,0 +1,29 @@
+
+# What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?
+
+# top right
+tr_sum = 1
+for i in range(1, 501):
+    tr_sum += pow(i * 2 + 1, 2)
+
+# bottom right
+br_sum = 1
+br_tmp = 1
+for i in range(1, 501):
+    br_tmp += 2 + 8 * (i-1)
+    br_sum += br_tmp
+
+# bottom left
+bl_sum = 1
+for i in range(1, 501):
+    bl_sum += pow(i * 2, 2) + 1
+
+# top left
+tl_sum = 1
+tl_tmp = 1
+for i in range(1, 501):
+    tl_tmp += (i-1) * 8 + 6
+    tl_sum += tl_tmp
+
+# I guess the problem is looking to not repeat the center case to take away 3
+print(tl_sum + bl_sum + br_sum + tr_sum - 3)