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binary palindromic numbers

A binary-palindromic number has a binary representation that reads the same forwards and backwards.

The first few binary palindromic numbers are: 3, 5, 7, 9, 15, 17, 21, 27, 31, 33, 45, …

1,999 of the first one million positive integers are binary palindromic.

Learn more about binary palindromic numbers on wikipedia.

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