91/Historical Note
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Historical Note on $91$ (Ninety-One)
There are $91$ days in a quarter-year: $13$ weeks of $7$ days each.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $91$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $91$