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A037537
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Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.
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0
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1, 6, 25, 101, 406, 1625, 6501, 26006, 104025, 416101, 1664406, 6657625, 26630501, 106522006, 426088025, 1704352101, 6817408406, 27269633625, 109078534501, 436314138006, 1745256552025, 6981026208101, 27924104832406
(list; graph; refs; listen; history; internal format)
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