Search: id:A125499
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%I A125499
%S A125499 2,4,8,10,14,16,22,26,32,34,38,44,46,50,52,58,62,64,68,74,76,82,86,92,
%T A125499 94,98,106,110,116,118,122,124,128,130,134,136,142,146,148,152,154,158,
%U A125499 164,166,170,172,178,182,184,188,190,194,202,206,212,214,218,226,230
%N A125499 Deficient even numbers.
%H A125499 R. J. Mathar, <a href="b125499.txt">Table of n, a(n) for n = 1..3375</
               a>
%e A125499 22 is in the sequence because it is even and its sum of divisors 1+2+11+22=36 
               is less than 2*22.
%p A125499 with(numtheory): a:=proc(n) if sigma(n)<2*n and n mod 2 = 0 then n else 
               fi end: seq(a(n),n=1..290); - Emeric Deutsch (deutsch(AT)duke.poly.edu), 
               Jan 01 2007
%p A125499 isA005100 := proc(n) if numtheory[sigma](n) < 2*n then RETURN(true) ; 
               else RETURN(false) ; fi ; end : for n from 2 to 800 by 2 do if isA005100(n) 
               then printf("%d,",n) ; fi ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Jan 07 2007
%Y A125499 Cf. A005100 = deficient numbers.
%Y A125499 Sequence in context: A071703 A010069 A132895 this_sequence A153974 A034822 
               A050567
%Y A125499 Adjacent sequences: A125496 A125497 A125498 this_sequence A125500 A125501 
               A125502
%K A125499 nonn
%O A125499 1,1
%A A125499 Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 27 2006
%E A125499 More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2007

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