A069553 Define S(k) to be the sequence of divisors and multiples of k, e.g. S(1) = 1,2,3,4,5... S(2) = 1,2,4,6,8,10,... S(10) = 1,2,5,10,20,30,40,50,...; a(n) = n-th term of the n-th sequence S(n).

1, 2, 6, 8, 20, 18, 42, 40, 63, 70, 110, 84, 156, 154, 180, 192, 272, 234, 342, 300, 378, 418, 506, 408, 575, 598, 648, 644, 812, 690, 930, 864, 990, 1054, 1120, 1008, 1332, 1330, 1404, 1320, 1640, 1470, 1806, 1716, 1800, 1978, 2162, 1872, 2303, 2250, 2448