Puzzle 293
What number completes this sequence:
4 15 14 11 5 {?}
Puzzle Copyright © Kevin Stone
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Hint
Think of the alphabet.
Answer
25 for Y.
These are the positions of the letters of the alphabet, and they are spelling Donkey.
Puzzle 294
What comes next in this sequence:
boron carbon nitrogen oxygen {?}
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Hint
The first in the list would be Hydrogen.
Answer
Fluorine.
These are the elements in atomic number order.
Puzzle 295
Can you find three consecutive prime numbers …
… which total 190,747 when multiplied together?
Puzzle Copyright © Kevin Stone
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Hint
Try finding the cube root of 190,747.
Answer
53, 59, and 61.
Reasoning
Start by taking the cube root of 190,747, which is approximately 57.56.
The next highest prime number is 59:
190,747 ÷ 59 = 3,233
Let's try the next prime number, which is 61:
3,233 ÷ 61 = 53
53, 59, and 61, are all prime, and are consecutive, so this is the answer.
Double-Checking
53 x 59 x 61 = 190,747
Puzzle 296
Which pair of letters comes next in this sequence:
on et wo th re ef ou {?}
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Hint
Try removing the spaces.
Answer
rf.
This sequence spells out the numbers onetwothreefourfive etc.
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