a(n) = numerator of Sum_{d|n} (tau(d)/sigma(d)) where tau(k) = the number of the divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).
A323779
a(n) = numerator of Sum_{d|n} (tau(d)/sigma(d)) where tau(k) = the number of the divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).
Terms
- a(0) =1a(1) =5a(2) =3a(3) =44a(4) =4a(5) =5a(6) =5a(7) =248a(8) =45a(9) =20a(10) =7a(11) =22a(12) =8a(13) =25a(14) =2a(15) =8213a(16) =10a(17) =75a(18) =11a(19) =176a(20) =15a(21) =35a(22) =13a(23) =124a(24) =133a(25) =40a(26) =119a(27) =55a(28) =16a(29) =10
External references
- oeis: A323779