WOLFRAM|DEMONSTRATIONS PROJECT

Number Guessing with Ternary Numbers

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step number
one
two
three
four
five
six
seven
eight
guess!
is the number in the list?
one
two
three
four
five
six
seven
eight
explain the secret to me!
play again
1
4
7
10
13
16
19
22
25
28
31
34
37
40
43
46
49
52
55
58
61
64
67
70
73
76
79
Think of an integer number between 1 and 80. If your number is in the list, click the checkbox for the step.
Next step!

An example of the kind of problem often posed as "Think of an integer and I will guess it." You need to know about ternary numbers to understand the trick.