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1, 3, 3, 6, 3, 10, 3, 11, 7, 12, 3, 22, 3, 14, 13, 20, 3, 27, 3, 28, 15, 18, 3, 44, 9, 20, 17, 34, 3, 50, 3, 37, 19, 24, 17, 64, 3, 26, 21, 58, 3, 62, 3, 46, 39, 30, 3, 86, 11, 49, 25, 52, 3, 74, 21, 72, 27, 36, 3, 120, 3, 38, 47, 70, 23, 86, 3, 64, 31, 82, 3, 135, 3, 44, 55, 70, 23, 98, 3
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(10) = A007503(10) - 10 = 22 - 10 = 12.
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MATHEMATICA
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Table[Apply[Plus, DivisorSigma[#, n] & /@ {0, 1}] - n, {n, 79}] (* Michael De Vlieger, Feb 25 2018 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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