%I A000441 M4613 N1968
%S A000441 1,9,34,95,210,406,740,1161,1920,2695,4116,5369,7868,9690,13640,
%T A000441 16116,22419,25365,34160,38640,50622,55154,73320,77225,100100,107730
%N A000441 Related to the divisor function.
%D A000441 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000441 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000441 J. Touchard, On prime numbers and perfect numbers, Scripta Math., 129 
               (1953), 35-39.
%Y A000441 Sequence in context: A106598 A014816 A147691 this_sequence A067989 A002881 
               A005344
%Y A000441 Adjacent sequences: A000438 A000439 A000440 this_sequence A000442 A000443 
               A000444
%K A000441 nonn
%O A000441 1,2
%A A000441 N. J. A. Sloane (njas(AT)research.att.com).