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A127424
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Numbers whose decimal expansion is a concatenation of 3 consecutive decreasing numbers.
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0
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21, 321, 432, 543, 654, 765, 876, 987, 1098, 11109, 121110, 131211, 141312, 151413, 161514, 171615, 181716, 191817, 201918, 212019
(list; graph; refs; listen; history; internal format)
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