Numbers m such that Sum_{d|m} (tau(d)/sigma(d)) is an integer h where tau(k) = the number of the divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).

A323781

Numbers m such that Sum_{d|m} (tau(d)/sigma(d)) is an integer h 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) =15a(2) =429a(3) =609a(4) =6003a(5) =9156a(6) =20943a(7) =75579a(8) =90252a(9) =93849a(10) =115773a(11) =331359a(12) =631764a(13) =744993a(14) =817191a(15) =837655a(16) =925083a(17) =1130766a(18) =1141191a(19) =2349087a(20) =2491740a(21) =2512965a(22) =3040728a(23) =3266253a(24) =3796143a(25) =4314891a(26) =4365231a(27) =5025930a(28) =5294340a(29) =6135624

External references