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A103846
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Sum of the non-unitary divisors of A064115(n) (or of 1+A064115(n)).
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2
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96, 864, 2160, 5400, 9600, 6720, 46080, 94080, 108864, 191968, 138240, 345600, 380160, 482976, 287280, 806400, 1016064, 777600, 1814400, 3317760, 3686400, 3352320, 5491200, 5160960, 3839400, 5702400, 4976640, 7464960, 7711200, 8259840, 10108800, 12005760, 10886400
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OFFSET
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1,1
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LINKS
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EXAMPLE
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A103846(1)=96 is the sum of the non-unitary divisors of A064115(1)=188 and also of 1+A064115(1)=189: 2+94=96 and 3+9+21+63=96.
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MATHEMATICA
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nusigma[1]=0; nusigma[n_] := DivisorSigma[1, n] - Times @@ (1 + Power @@@ FactorInteger[n]); seq={}; s1=0; Do[s2=nusigma[n]; If[s1>0 && s2==s1, AppendTo[seq, s1]]; s1=s2, {n, 1, 10^6}]; seq (* Amiram Eldar, Jun 10 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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