**Sum of proper divisors (or aliquot parts) of n: sum of divisors of n that are less than n.**

*0, 1, 1, 3, 1, 6, 1, 7, 4, 8, 1, 16, 1, 10, 9, 15, 1, 21, 1, 22, 11, 14, 1, 36, 6, 16, 13, 28, 1*

*6 seqfan posts*

*Thu Feb 18 08:45:33 CET 2010* [seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

*Wed Feb 17 23:29:17 CET 2010* [seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

*Wed Feb 17 23:29:17 CET 2010* [seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

*Wed Feb 17 19:02:07 CET 2010* [seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

*Thu Dec 18 23:36:26 CET 2008* [seqfan] Re: Mathematica and aspiring numbers

*Thu Dec 18 23:20:34 CET 2008* [seqfan] Re: Mathematica and aspiring numbers

Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword

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