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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