The UT Grotto meets on the first, third, and fifth (if any) Wednesdays
of the month. Pete Strickland pointed out that our meeting on February
29 this year was a rare occurrence, because it requires that the year
be a leap year and February 29 be a Wednesday. Roughly speaking, this
occurs every 28 (= 4 x 7) years. But not really, because years
divisible by 100 but not 400 are not leap years. (2000 was a leap
year, but 2100 will not be). Here's a table of years when UTG has or
will meet three times in February:
<<Calendar`
Do[If[DayOfWeek[{x,2,29}]==Wednesday, Print[x]],{x,1960,3000,4}]
1984
2012
2040
2068
2096
2108
2136
2164
2192
2204
2232
2260
2288
2328
2356
2384
2412
2440
2468
2496
2508
2536
2564
2592
2604
2632
2660
2688
2728
2756
2784
2812
2840
2868
2896
2908
2936
2964
2992
--Mixon
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