diff --git a/problem10.py b/problem10.py
new file mode 100644
index 0000000..0841544
--- /dev/null
+++ b/problem10.py
@@ -0,0 +1,25 @@
+'''nums = [i for i in range(2,20000)]
+primes = 0
+
+while len(nums) > 0:
+
+  prime = nums.pop(0)
+  print(prime)
+  primes += prime
+
+  for n in nums:
+    if n % prime == 0:
+      nums.remove(n)'''
+
+primes = []
+for n in range(2,20000):
+  for p in primes:
+    if n % p == 0:
+      break
+    if n < p*p:
+      primes.append(n)
+      break
+  else:
+    primes.append(n)
+
+print(sum(primes))
diff --git a/problem11.py b/problem11.py
new file mode 100644
index 0000000..923008c
--- /dev/null
+++ b/problem11.py
@@ -0,0 +1,72 @@
+nums_s = '''08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
+49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
+81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
+52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
+22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
+24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
+32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
+67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
+24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
+21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
+78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
+16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
+86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
+19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
+04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
+88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
+04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
+20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
+20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
+01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48'''
+
+nums = []
+
+for i in nums_s.split('\n'): # break the grid into rows
+  nums.append(
+    list(
+      map(int, i.split(' '))
+  ))
+
+grid_size = len(nums)
+
+def invert(arr):
+  new = [[] for _ in range(grid_size)]
+  for row in nums:
+    for i in range(grid_size):
+      new[i].append(row[i])
+  return new
+
+def mul(li):
+  r = 1
+  for x in li:
+      r *= x
+  return r
+
+line_len = 4
+
+greatest = 0
+
+for grid in [nums, invert(nums)]:
+  for row in grid:
+    for j in range(grid_size - line_len):
+      line = []
+      for i in range(line_len):
+        line.append(row[j + i])
+
+      if mul(line) > greatest:
+        greatest = mul(line)
+
+  for i in range(grid_size - line_len):
+    for j in range(grid_size - line_len):
+      line1 = []
+      line2 = []
+      for inc in range(line_len):
+        line1.append(grid[i + inc][j + inc])
+        line2.append(grid[i - inc][j + inc])
+
+      if mul(line1) > greatest:
+        greatest = mul(line1)
+      if mul(line2) > greatest:
+        greatest = mul(line2)
+
+print(greatest)