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I just came up with this one, what is the value of N in this sequence

7,5,1,2,4,8,N?

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9
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    $\begingroup$ Is "N?" the blank you want filled, or is the N part of the sequence? $\endgroup$
    – Gareth McCaughan
    Aug 26, 2016 at 14:17
  • $\begingroup$ @GarethMcCaughan N is the value, I've updated the question to clarify this. Unfortunately I couldn't post the question without a sentence ending punctuation mark $\endgroup$
    – Steve
    Aug 26, 2016 at 14:19
  • $\begingroup$ OK, that's clearer. And would you like to indicate whether the sequence continues on after the number N or steps there, and; whether it continues backwards before the 7 or starts there? (You might prefer not to, of course.) $\endgroup$
    – Gareth McCaughan
    Aug 26, 2016 at 14:21
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    $\begingroup$ inspired by sandbox,i think all of these sequence puzzle should go through oeis $\endgroup$
    – Numberknot
    Aug 26, 2016 at 14:24
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    $\begingroup$ @Steve In the help center you can read about what is on topic. That page also has several links at the bottom that give more information on what makes a good puzzle for this site. $\endgroup$
    – Scott M
    Aug 26, 2016 at 14:50

1 Answer 1

6
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N is

7

because

each number is the previous number times 2, mod 9.

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2
  • $\begingroup$ Correct answer! $\endgroup$
    – Steve
    Aug 26, 2016 at 14:23
  • $\begingroup$ oeis says too.. $\endgroup$
    – Numberknot
    Aug 26, 2016 at 14:24

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