31 is odd.
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Nope 31 and 41 are odd numbers.
No, I don't think so. 31 is an odd number.
It is the twelfth month of the year and in that context is even. It has 31 days: in that context it is odd.
There is no set of three consecutive odd or even integers whose sum is negative 31.
by their nature the days of the week by name are neither even or odd. The numerical day of the month a day falls on can be either even or odd. Note that a month with 31 days will have an odd day at the end of month followed immediately by another odd day. This never happens for even days.