Numerators of rational valued sequence f whose Dirichlet convolution with itself yields A000203 (sigma, the sum of divisors).

A317831

Numerators of rational valued sequence f whose Dirichlet convolution with itself yields A000203 (sigma, the sum of divisors).

Terms

    a(0) =1a(1) =3a(2) =2a(3) =19a(4) =3a(5) =3a(6) =4a(7) =63a(8) =9a(9) =9a(10) =6a(11) =19a(12) =7a(13) =6a(14) =6a(15) =867a(16) =9a(17) =27a(18) =10a(19) =57a(20) =8a(21) =9a(22) =12a(23) =63a(24) =11a(25) =21a(26) =11a(27) =19a(28) =15a(29) =9

External references