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A077378
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Squarefree numbers whose external as well as internal digits digits form a squarefree number.
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4
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123, 127, 129, 130, 131, 133, 134, 137, 139, 151, 154, 155, 157, 159, 161, 163, 165, 167, 170, 173, 174, 177, 179, 221, 222, 223, 226, 229
(list; graph; refs; listen; history; internal format)
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