Day 15.

15.py

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+import itertools
+import operator
+
+
+def gen(seed, factor, multiple=1):
+    value = seed
+    while True:
+        value = (value * factor) % 2147483647
+        if value % multiple == 0:
+            yield value & 65535
+
+
+with open('data/15.txt', 'r') as file:
+    seeds = [int(line.strip().split()[-1]) for line in file.readlines()]
+    print(f'Part one: {sum(map(lambda t: t[0] == t[1], itertools.islice(zip(gen(seeds[0], 16807), gen(seeds[1], 48271)), 40_000_000)))}')
+    print(f'Part two: {sum(map(lambda t: t[0] == t[1], itertools.islice(zip(gen(seeds[0], 16807, 4), gen(seeds[1], 48271, 8)), 5_000_000)))}')

data/15.txt

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+Generator A starts with 699
+Generator B starts with 124