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1, 2, 3, 4, 2, 4, 2, 3, 6, 1, 2, 4, 3, 4, 5, 7, 6, 5, 6, 7, 6, 7, 4, 2, 4, 3, 8, 5, 6, 8, 6, 2, 8, 3, 7, 4, 8, 6, 10, 10, 7, 10, 9, 10, 12, 10, 2, 4, 6, 11, 7, 4, 10, 6, 5, 7, 11, 2, 3, 9, 5, 8, 6, 8, 12, 7, 11, 10, 12, 1, 3, 11, 4, 10, 8, 7, 10, 4, 15, 12, 6
(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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EXAMPLE
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MATHEMATICA
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t=Select[Table[2n, {n, 1, 7*10^7}], DivisorSigma[1, 2#-DivisorSigma[1, #]]+1 == 2(2#-DivisorSigma[1, #])>2 &]; u=Table[2t[[k]]-DivisorSigma[1, t[[k]], {k, 81}]; Log[2, u] (* or *)
Select[Log2[2 # - DivisorSigma[1, #]] & /@ (2 Range@33500), IntegerQ[#] && # > 0 &] (* Giovanni Resta, Aug 08 2017 *)
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CROSSREFS
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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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