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A037576
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Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 1,3.
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5
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1, 7, 29, 119, 477, 1911, 7645, 30583, 122333, 489335, 1957341, 7829367, 31317469, 125269879, 501079517, 2004318071, 8017272285, 32069089143, 128276356573, 513105426295, 2052421705181, 8209686820727, 32838747282909
(list; graph; refs; listen; history; internal format)
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