Numbers j such that the average of the divisors of j is an integer: sigma_0(j) divides sigma_1(j). Alternatively, numbers j such that tau(j) (A000005(j)) divides sigma(j) (A000203(j)).
A003601
Numbers j such that the average of the divisors of j is an integer: sigma_0(j) divides sigma_1(j). Alternatively, numbers j such that tau(j) (A000005(j)) divides sigma(j) (A000203(j)).
Terms
- a(0) =1a(1) =3a(2) =5a(3) =6a(4) =7a(5) =11a(6) =13a(7) =14a(8) =15a(9) =17a(10) =19a(11) =20a(12) =21a(13) =22a(14) =23a(15) =27a(16) =29a(17) =30a(18) =31a(19) =33a(20) =35a(21) =37a(22) =38a(23) =39a(24) =41a(25) =42a(26) =43a(27) =44a(28) =45a(29) =46
External references
- oeis: A003601