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A056459
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Primitive (aperiodic) palindromes using a maximum of three different symbols.
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3
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3, 0, 6, 6, 24, 18, 78, 72, 234, 216, 726, 696, 2184, 2106, 6528, 6480, 19680, 19422, 59046, 58800, 177060, 176418, 531438, 530640, 1594296, 1592136, 4782726, 4780776, 14348904, 14342112, 43046718
(list; graph; refs; listen; history; internal format)
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