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A055145
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The first n digits of the juxtaposition of the base 4 numbers converted to decimal.
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4
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1, 6, 27, 109, 436, 1745, 6981, 27925, 111702, 446809, 1787239, 7148958, 28595832, 114383330, 457533321, 1830133286, 7320533146, 29282132586, 117128530347, 468514121391, 1874056485564, 7496225942259, 29984903769037
(list; graph; refs; listen; history; internal format)
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