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Aziz Inan is a professor and chair of the electrical engineering program teaching in the Donald P. Shiley School of Engineering at University of Portland.

Thanksgiving Day falls on Nov. 22, the earliest day of November when this holiday can occur. Last time this happened was in 2012, and next time it will happen again after this year is in 2029.

Thanksgiving cycles backwards between Nov. 22 and 28 by occurring one or two days earlier each year depending on whether next year is a non-leap or leap year. When Thanksgiving occurs on November 22 (e.g., 2018), next year, it moves forward to either Nov. 27 (if leap year) or 28 (if non-leap year) and continues its backwards cycle as each year goes by.

Last year, Thanksgiving occurred on Nov. 23, 2017, and this year, it occurs one day earlier, on November 22. Next year, 2019, Thanksgiving will move forward to Nov. 28. In 2020 (leap year), Thanksgiving will shift from Nov. 28 backwards by two days, occurring on November 26 and then, in 2021, it will shift backwards by one day to occur on Nov. 25.

As I investigated the upcoming Thanksgiving Day expressed as 11/22/2018, I found some interesting numerical properties related to it and as a result, I constructed the following numerical curiosities for your recreational enjoyment on Thanksgiving Day:

1. If 2018 is split in the middle as 20 and 18, 20 plus 18 equals 38, the 38th prime number is 163, and twice 163 yields 326. Coincidentally, the 326th day of 2018 is this year's Thanksgiving Day, Nov. 22 (11/22). (As an aside, note that the reverse of 163 is 361, 361 equals 19 x 19, and 19 plus 19 gives back 38.)

2. Furthermore, the prime factors of 326, namely 2 and 163, are the 1st and 38th prime numbers and 1 plus 38 equals 39. Interestingly, there are 39 days left in 2018 after Thanksgiving Day, November 22.

3. The sum of the digits of 326 and 2018 each equals 11, 11 plus 11 yields 22, and 11 and 22 put side by side results in 1122 (November 22).

4. Additionally, 2018 equals twice 1009, 1009 is the 169th prime number, 169 is 13 square, and the sum of the digits of 13 (4) times 13 times its reverse, namely 31, equals 1612. Interestingly, the reverse of 1612, namely 2161, is the 326th prime number. Wow!

5. If Nov. 22 expressed as 1122 is split as 11 and 22, the sum of 11 and 22 equals 33. Interestingly, the prime factors of 1122, namely 2, 3, 11, and 17, add up to 33 too.

6. Moreover, 1122 equals 33 times 33 plus 33.

7. Additionally, the difference between 1122 and its reverse, namely 2211, equals 33 x 33.

8. Further, 1122 plus 2211 equals 3333, that is, two 33's put side by side.

9. Also, the sum of the prime factors of 326 (see item No. 2), namely 2 and 163, equals 165 and 165 equals five times 33.

10. The prime factors of 326, namely 2 and 163, differ by 161, 161 equals 7 times 23, the 7th and the 23rd prime numbers are 17 and 83, and interestingly, 17 and 83 differ by 66, which is twice 33.

11. Next year (2019) has 33 days left after Thanksgiving Day to occur on November 28 (11/28).

12. If next year's Thanksgiving Day expressed as 11/28/2019 is split as 11, 28, 20, and 19, 11 plus 28 equals 20 plus 19 equals 39.

13. Thanksgiving consists of 12 letters and interestingly, this year's Thanksgiving Day, November 22 expressed as 1122 consists of two 12's, intertwined.

14. Finally, the sum of the digits of next year's Thanksgiving Day, Nov. 28, expressed as 11/28 equals 12 too.

Happy Thanksgiving.

Aziz Inan is a professor and chair of the electrical engineering program teaching in the Donald P. Shiley School of Engineering at University of Portland and he can be reached at This email address is being protected from spambots. You need JavaScript enabled to view it..

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