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Thread: What number comes next in the sequence:?

  1. #1
    Join Date
    Aug 2007
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    Default What number comes next in the sequence:?

    61, 691, 163, 487, 4201, ?

  2. #2
    Join Date
    Aug 2007
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    1

    Default

    9631

    the numbers are prime numbers that, when their digits are reversed, are perfect squares. Thanks for the challenge!

  3. #3
    Join Date
    Aug 2007
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    Default

    If you look at the sequence, you'll notice that every number is prime. Also, if you reverse each number, you get:

    16,196,361,784,1024

    and each of these numbers are perfect squares. So which number is prime and if reversed is a perfect square? Well to save you time the number is 9631. The reverse of that number, 1369, is a perfect square, and 9631 is prime.
    So the next number in the sequence is 9361

    Answer is 9631

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