Search: id:A077374
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%I A077374
%S A077374 1,3,5,7,9,11,15,21,315,1155,8925,32445,442365,815634435
%N A077374 Odd numbers whose abundance b satisfies -10 <= b <= 10, where the abundance 
               of a number n is A(n) = sigma(n) - 2n.
%H A077374 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Abundance.html">Abundance</a>
%e A077374 sigma(32445) = 64896 and 32445*2 = 64890, which makes the odd number 
               32445 six away from perfection: A(32445) = 6 and hence in this sequence.
%o A077374 (PARI) forstep(n=1,442365,2,if(abs(sigma(n)-2*n)<=10,print1(n,",")))
%Y A077374 Cf. A033879, A033880, A000203.
%Y A077374 Cf. A088012.
%Y A077374 Sequence in context: A165705 A118360 A077799 this_sequence A133848 A064076 
               A050842
%Y A077374 Adjacent sequences: A077371 A077372 A077373 this_sequence A077375 A077376 
               A077377
%K A077374 nonn
%O A077374 1,2
%A A077374 Jason Earls (zevi_35711(AT)yahoo.com), Nov 30 2002
%E A077374 815634435 from Farideh Firoozbakht (f.firoozbakht(AT)sci.ui.ac.ir), Jan 
               12 2004

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