Initial data commit

Task/Unprimeable-numbers/Python/unprimeable-numbers.py

@@ -0,0 +1,52 @@
+from itertools import count, islice
+
+def primes(_cache=[2, 3]):
+    yield from _cache
+    for n in count(_cache[-1]+2, 2):
+        if isprime(n):
+            _cache.append(n)
+            yield n
+
+def isprime(n, _seen={0: False, 1: False}):
+    def _isprime(n):
+        for p in primes():
+            if p*p > n:
+                return True
+            if n%p == 0:
+                return False
+
+    if n not in _seen:
+        _seen[n] = _isprime(n)
+    return _seen[n]
+
+def unprime():
+    for a in count(1):
+        d = 1
+        while d <= a:
+            base = (a//(d*10))*(d*10) + (a%d) # remove current digit
+            if any(isprime(y) for y in range(base, base + d*10, d)):
+                break
+            d *= 10
+        else:
+            yield a
+
+
+print('First 35:')
+print(' '.join(str(i) for i in islice(unprime(), 35)))
+
+print('\nThe 600-th:')
+print(list(islice(unprime(), 599, 600))[0])
+print()
+
+first, need = [False]*10, 10
+for p in unprime():
+    i = p%10
+    if first[i]: continue
+
+    first[i] = p
+    need -= 1
+    if not need:
+        break
+
+for i,v in enumerate(first):
+    print(f'{i} ending: {v}')