Numbers k such that k and sigma(k) are relatively prime, where sigma(k) = sum of divisors of k (A000203).

A014567

Numbers k such that k and sigma(k) are relatively prime, where sigma(k) = sum of divisors of k (A000203).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =8a(7) =9a(8) =11a(9) =13a(10) =16a(11) =17a(12) =19a(13) =21a(14) =23a(15) =25a(16) =27a(17) =29a(18) =31a(19) =32a(20) =35a(21) =36a(22) =37a(23) =39a(24) =41a(25) =43a(26) =47a(27) =49a(28) =50a(29) =53

External references