Brain Teasers
64, 4, 16, 25, 9, 81, ?
What's the next number in this sequence?
64, 4, 16, 25, 9, 81, ?
64, 4, 16, 25, 9, 81, ?
Hint
It will repeat after some entries.Answer
49.Each number from the second is the square of the difference of the two digits of its preceding number. One-digit numbers are counted as two-digit numbers beginning with zero.
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