Least k such that phi(k) = phi(n).

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =5a(5) =3a(6) =7a(7) =5a(8) =7a(9) =5a(10) =11a(11) =5a(12) =13a(13) =7a(14) =15a(15) =15a(16) =17a(17) =7a(18) =19a(19) =15a(20) =13a(21) =11a(22) =23a(23) =15a(24) =25a(25) =13a(26) =19a(27) =13a(28) =29a(29) =15