Search: id:A057020
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%I A057020
%S A057020 1,3,2,7,3,3,4,15,13,9,6,14,7,6,6,31,9,13,10,7,8,9,12,15,31,21,10,28,
%T A057020 15,9,16,21,12,27,12,91,19,15,14,45,21,12,22,14,13,18,24,62,19,31,18,
%U A057020 49,27,15,18,15,20,45,30,14,31,24,52,127,21,18,34,21,24,18
%N A057020 Numerator of (sum of factors of n / number of factors of n).
%F A057020 a(n) =A057021(n)*A000203(n)/A000005(n) =A000203(n)/A009205(n) =(A057022(n)+A054025(n)/
               A000005(n))*A057021(n)
%e A057020 a(12)=14 since the 6 factors of 12 are 1, 2, 3, 4, 6 and 12 and 1+2+3+4+6+12=28 
               and 28/6=14/3
%p A057020 with(numtheory): seq(numer(sigma(n)/tau(n)), n=1..70) ; - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 04 2008
%t A057020 Numerator[Table[(Plus @@ Divisors[n])/Length[Divisors[n]], {n, 70}]] 
               (Alonso Delarte (alonso.delarte(AT)gmail.com))
%Y A057020 Cf. A000005, A000203, A009205, A054025, A057021 (denominator), A057022.
%Y A057020 Sequence in context: A137822 A099378 A071190 this_sequence A165794 A075270 
               A067872
%Y A057020 Adjacent sequences: A057017 A057018 A057019 this_sequence A057021 A057022 
               A057023
%K A057020 frac,nonn
%O A057020 1,2
%A A057020 Henry Bottomley (se16(AT)btinternet.com), Jul 21 2000

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