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A017969
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Powers of sqrt(21) rounded up.
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1
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1, 5, 21, 97, 441, 2021, 9261, 42440, 194481, 891224, 4084101, 18715702, 85766121, 393029742, 1801088541, 8253624573, 37822859361, 173326116022, 794280046581, 3639848436451, 16679880978201, 76436817165461
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