a(n) = sigma(sigma(...(sigma(n))...)) / n, where sigma (A000203) is iterated until a multiple of n is reached.

A019295

a(n) = sigma(sigma(...(sigma(n))...)) / n, where sigma (A000203) is iterated until a multiple of n is reached.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =2a(4) =24a(5) =2a(6) =24a(7) =3a(8) =168a(9) =12a(10) =1834560a(11) =10a(12) =84480a(13) =12a(14) =4a(15) =2a(16) =92520a(17) =20a(18) =62720a(19) =84a(20) =3a(21) =49920a(22) =6516224a(23) =7a(24) =881280a(25) =28a(26) =3360a(27) =2a(29) =728a(30) =912

External references