A103846 Sum of the non-unitary divisors of A064115(n) (or of 1+A064115(n)).

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

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..344 (calculated from the b-file at A064115 by Giovanni Resta)

Example

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.

Mathematica

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 *)

Crossrefs

Cf. A048146, A064115.

Sequence in context: A326576 A202890 A173615 * A203979 A296960 A202583

Adjacent sequences: A103843 A103844 A103845 * A103847 A103848 A103849

Keyword

nonn

Author

Emeric Deutsch, Feb 17 2005

Extensions

More terms from Amiram Eldar, Jun 10 2019

Status

approved