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A067501
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Powers of 4 with digit sum also a power of 4.
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10
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1, 4, 68719476736, 95780971304118053647396689196894323976171195136475136, 25108406941546723055343157692830665664409421777856138051584, 1606938044258990275541962092341162602522202993782792835301376
(list; graph; refs; listen; history; internal format)
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