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A071997
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a(n) is the smallest positive integer that cannot be obtained by using the number 2 at most n times and the operators +, -, *, /.
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0
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1, 3, 5, 7, 11, 19, 27, 43, 75, 115, 171, 307, 555, 691, 1383, 2467, 3627
(list; graph; refs; listen; history; internal format)
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