A121219 a(1)=1. a(n) = a(n-1)th integer from among those positive integers which do not occur earlier in the sequence and which are coprime to n.

1, 3, 5, 15, 21, 67, 83, 179, 275, 701, 780, 2359, 2567, 6011, 11284, 22593, 24019, 72089, 76112, 190311, 333064, 732773, 766103, 2298349, 2872961, 6224789, 9337213, 21786875, 22565006, 84618829, 87439484, 174879017, 288550415