A143480 a(1)=1. a(n) = the smallest positive multiple of n such that phi(a(n)) > phi(a(n-1)), where phi(m) is the number of positive integers <= m and coprime to m.

1, 4, 9, 16, 25, 72, 49, 104, 81, 160, 121, 348, 143, 322, 285, 352, 221, 648, 323, 800, 567, 814, 437, 1272, 575, 1066, 729, 1204, 667, 2370, 713, 1376, 1221, 1598, 1225, 2592, 1073, 2242, 1833, 2840, 1271, 4326, 1333, 2816, 2565, 2806, 1457, 4272, 1813