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ternary palindromic numbers

A ternary-palindromic number is a positive integer whose base-3 representation reads the same forwards and backwards, without leading zeros.

The first few ternary palindromic numbers are: 2, 4, 8, 10, 13, 16, 20, 23, 26, 28, 40, …

2,099 of the first one million positive integers are ternary palindromic.

Learn more about ternary palindromic numbers on wikipedia.

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