I had a look at the Trash folder in which I archive notices of attempted comments on the blog (most of which are spam). Since I last cleaned it, 164 posts have received two or more, and #1301 has had eighteen. Why? 1301 is not obviously a magic number.
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Originally it probably came up high on some Google search that someone ran. So it was put on a list of spam target pages that was included in some spamming software that was sold to a bunch of spammers.
There are about 4 pages on my site that they routinely hit. Fortunately, my current anti-spam measures seem to be working… only one spam comment has gotten through in the past month and a half.