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A114120
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Palindromes which are not the arithmetic mean of two distinct palindromes.
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0
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11, 10901, 109901, 1090901, 1099901, 10900901, 10999901, 100909001, 109000901, 109090901, 109909901, 109999901, 1090000901, 1090990901, 1099009901, 1099999901, 10090909001, 10900000901, 10900900901, 10909090901, 10909990901
(list; graph; refs; listen; history; internal format)
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