%I A002191 M2318 N0916
%S A002191 1,3,4,6,7,8,12,13,14,15,18,20,24,28,30,31,32,36,38,39,40,42,44,48,
%T A002191 54,56,57,60,62,63,68,72,74,78,80,84,90,91,93,96,98,102,104,108,110,
%U A002191 112,114,120,121,124,126,127,128,132,133,138,140,144,150,152,156
%N A002191 Possible values for sum of divisors of n.
%D A002191 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, 
               National Bureau of Standards Applied Math. Series 55, 1964 (and various 
               reprintings), p. 840.
%D A002191 J. W. L. Glaisher, Number-Divisor Tables. British Assoc. Math. Tables, 
               Vol. 8, Camb. Univ. Press, 1940, p. 85.
%D A002191 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002191 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002191 T. D. Noe, <a href="b002191.txt">Table of n, a(n) for n = 1..1000</a>
%H A002191 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.nrbook.com/
               abramowitz_and_stegun/">Handbook of Mathematical Functions</a>, National 
               Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 
               [alternative scanned copy].
%F A002191 Distinct values attained by the sigma(n) function, in ascending order.
%t A002191 Take[Union[Table[DivisorSigma[1,n],{n,6!}]],99] [From Vladimir Orlovsky 
               (4vladimir(AT)gmail.com), Feb 25 2009]
%Y A002191 Cf. A007609.
%Y A002191 Sequence in context: A047515 A066650 A007609 this_sequence A108348 A085149 
               A007370
%Y A002191 Adjacent sequences: A002188 A002189 A002190 this_sequence A002192 A002193 
               A002194
%K A002191 nonn
%O A002191 1,2
%A A002191 N. J. A. Sloane (njas(AT)research.att.com).