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A055859
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a(n) and floor[a(n)/7] are both squares; i.e. squares which remain squares when written in base 7 and last digit is removed.
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15
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0, 1, 4, 9, 64, 256, 2025, 16129, 64516, 514089, 4096576, 16386304, 130576329, 1040514049, 4162056196, 33165873225, 264286471744, 1057145886976, 8424001222569, 67127723308801, 268510893235204, 2139663144659049, 17050177433963584, 68200709735854336
(list; graph; refs; listen; history; internal format)
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