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A015880
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Numbers k such that sigma(k) = sigma(k+10).
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15
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21, 174, 270, 517, 572, 913, 992, 1002, 1420, 1633, 1830, 2622, 2958, 4170, 4747, 5539, 7520, 7544, 7729, 10184, 10783, 14863, 16165, 16520, 19837, 20935, 21584, 23161, 26840, 28544, 29737, 31453, 34510, 35571, 35611, 35845, 39560
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Range[40000], DivisorSigma[1, #]==DivisorSigma[1, # + 10] &] (* Vincenzo Librandi, Mar 10 2014 *)
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PROG
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CROSSREFS
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Cf. A002961, A007373, A015861, A015863, A015865, A015866, A015867, A015876, A015877, A015881, A015882, A015883, A181647.
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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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