thirteen – Print dates of Friday 13th days
The (plain TeX) file prints the dates of Friday 13th days, from 1991–2003. (This was an exercise for beginner programmers in the 1960s…)
Maybe you are interested in the following packages as well.
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- hanoi: Tower of Hanoi in TeX
- plain-cm: Variable sized fonts in Plain TeX
- twocolumns: Knuth's two-column output macros