Search: id:A019287
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%I A019287
%S A019287 480,504,13824,32256,32736,1980342,1396617984,3258775296
%N A019287 Let sigma_m (n) be result of applying sum-of-divisors function m times 
               to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the 
               (2,10)-perfect numbers.
%C A019287 See also the Cohen-te Reile links under A019276.
%D A019287 Graeme L. Cohen and Herman J. J. te Riele, Iterating the sum-of-divisors 
               function, Experimental Mathematics, 5 (1996), pp. 93-100.
%H A019287 Experimental Mathematics, <a href="http://www.expmath.org/">Home Page</
               a>
%Y A019287 Sequence in context: A025025 A108256 A115157 this_sequence A108876 A083728 
               A063870
%Y A019287 Adjacent sequences: A019284 A019285 A019286 this_sequence A019288 A019289 
               A019290
%K A019287 nonn
%O A019287 1,1
%A A019287 N. J. A. Sloane (njas(AT)research.att.com).
%E A019287 More terms from Jud McCranie (j.mccranie(AT)comcast.net), Nov 13 2001

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