A164528 a(1)=2. a(n) = the smallest multiple of {the largest proper divisor of n} that is > a(n-1).

2, 3, 4, 6, 7, 9, 10, 12, 15, 20, 21, 24, 25, 28, 30, 32, 33, 36, 37, 40, 42, 44, 45, 48, 50, 52, 54, 56, 57, 60, 61, 64, 66, 68, 70, 72, 73, 76, 78, 80, 81, 84, 85, 88, 90, 92, 93, 96, 98, 100, 102, 104, 105, 108, 110, 112, 114, 116, 117, 120, 121, 124, 126, 128, 130, 132