#math trivia for #September28: #271 is a permutation of digits 1, 2, 7. Which other day-numbers (1-365) are a permutation of these digits?

— Burt Kaliski Jr. (@modulomathy) September 29, 2013

There are six possible permutations of any three distinct digits; in this case, the six possibilities are:

- 127
- 172
- 217
- 271
- 712
- 721

However, only the first four are day-numbers, so the answer is 127, 172, 217.