Determine what is missing in the following two sequences:
Sequence #1: What is the missing number in this sequence:
43, 41, 37, 31, 29, ___, 19, 17
Sequence #2: What letter comes next in the following sequence:
A, S, D, F, G, H, J, ___
Solution:
Sequence #1: The answer is 23 or 25.
To get 23, it is a list of consecutive prime numbers in descending order (23 is missing).
To get 25, begin with 43, then subtract 2 to get the next term, subtract 4 to get the next term, then subtract 6 to get the next term, then repeat subtracting 2, then 4, then 6, then 2, ...
Sequence #2: The answer is K or U.
To get K, look at the second row of your computer keyboard (which was the intended answer).
However, three problem solvers sent in U. The letters of the
alphabet run in a circle. From A move forward 18 to S, then move
11 to D, then move 2 places to F, then 1 to G. Then go 1 to H,
then move 2 to J, then move 11 to U.
Correctly solved by:
| 1. Rick Jones | Kennett Square, Pennsylvania |
| 2. Bob Hearn | Winchester, Virginia |
| 3. Jaime Garcia | Winchester, Virginia |
| 4. Jonathan O'Neill | Winchester, Virginia |
| 5. David Marut | Winchester, Virginia |
| 6. Jason Farmer | Winchester, Virginia |
| 7. Chip Schweikarth | Winchester, Virginia |
| 8. George Gaither | Winchester, Virginia |
| 9. Tom Kelley | Winchester, Virginia |
| 10. David Powell | Winchester, Virginia |
| 11. Keith Mealy | Cincinnati, Ohio |
| 12. Ricki Stern | Highland Park, New Jersey |
| 13. Richard Johnson | La Jolla, California |
| 14. Joe Heintz | Manchester, Tennessee |
| 15. ---------- | Feltham, Middx, United Kingdom |
| 16. Bill Hall | Wellington, Florida |
| 17. Erin McGinnis | Winchester, Virginia |
| 18. Izzy Kushner | Closter, New Jersey |
| 19. Robert Bennington's Grade 7 Math Class |
High River, Alberta, Canada |
| 20. John C. Funk | Ventura, California |