Least number k such that n divides gcd(sigma(k), phi(k)) (A009223).

Terms

a(0) =1a(1) =3a(2) =14a(3) =12a(4) =88a(5) =14a(6) =116a(7) =15a(8) =190a(9) =88a(10) =989a(11) =35a(12) =477a(13) =116a(14) =209a(15) =105a(16) =6901a(17) =190a(18) =7067a(19) =88a(20) =196a(21) =989a(22) =6439a(23) =35a(24) =15049a(25) =477a(26) =2754a(27) =172a(28) =10207a(29) =209