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A033122
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Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,1.
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0
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1, 4, 17, 69, 276, 1105, 4421, 17684, 70737, 282949, 1131796, 4527185, 18108741, 72434964, 289739857, 1158959429, 4635837716, 18543350865, 74173403461, 296693613844, 1186774455377, 4747097821509, 18988391286036, 75953565144145
(list; graph; refs; listen; history; internal format)
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