Numbers k such that (sigma(k) + sigma(k + sigma(k))) / k is an integer where sigma(k) = A000203(k) is the sum of the divisors of k.

A383392

Numbers k such that (sigma(k) + sigma(k + sigma(k))) / k is an integer where sigma(k) = A000203(k) is the sum of the divisors of k.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =19a(4) =27a(5) =28a(6) =48a(7) =139a(8) =164a(9) =243a(10) =496a(11) =1428a(12) =1440a(13) =3360a(14) =3480a(15) =5932a(16) =8128a(17) =11004a(18) =19683a(19) =25296a(20) =27144a(21) =31756a(22) =35616a(23) =45436a(24) =47520a(25) =51480a(26) =84000a(27) =115506a(28) =218520a(29) =221088

External references