X1 = 2
X2k = X2k-1 + k
X2k+1 = X2k*k
The next few numbers are 5346, 5353, 37471, 37479, 299832, 299841.
X2k = X2k-1 + k
X2k+1 = X2k*k
The next few numbers are 5346, 5353, 37471, 37479, 299832, 299841.