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A255641
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Smallest number requiring n 1's to build using +, * and -.
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4
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1, 2, 3, 4, 5, 7, 10, 11, 17, 22, 29, 41, 58, 67, 101, 131, 173, 262, 346, 461, 617, 787, 1123, 1571, 2077, 2767, 4153, 5443, 7963, 10733, 13997, 21101, 27997, 36643, 49747, 72103, 99317, 143239, 179107, 260213
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OFFSET
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1,2
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COMMENTS
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Until n = 10 the terms are equal to A005520(n) where subtraction is not allowed.
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LINKS
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EXAMPLE
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a(11) = 29, because 23 = (1+1)*(1+1)*(1+1)*(1+1+1)-1, but 29 = ((1+1+1)*(1+1)+1)*(1+1)*(1+1)+1.
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CROSSREFS
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Least inverse (or records) of A091333.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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