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You are a mechanic for McSmith Waterworks. You are called on site due to an emergency. A secret chamber has been discovered and some machinery in it has been activated. This machinery starts increasing the pressure of the water continuously, never stopping unless stopped internally (very bad).

At the entrance is a gate with a sign and several numbers (The numbers are buttons) below it. The sign says:

Prime my pump backwards and enter!

Numbers:

            1
           2 3
          4 5 6
        7 8 9 10
       11 12 13 14
      15 16 17 18 19
     20 21 22 23 24 25
    26 27 28 29 30 31 32
   33 34 35 36 37 38 39 40
  41 42 43 44 45 46 47 48 49

Which buttons do you press and in which order?

"Hat tip to Stephen King"

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    $\begingroup$ Downvoted because there can be multiple valid answers, i.e. too broad. $\endgroup$
    – newzad
    Jul 9, 2016 at 11:29
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    $\begingroup$ @nikamed how so? the logic of the question takes in only 1 valid answer $\endgroup$ Jul 9, 2016 at 11:30
  • 1
    $\begingroup$ @nikamed, the answer by Beastly Gerbil shows a very simple solution $\endgroup$
    – user20998
    Jul 9, 2016 at 11:31
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    $\begingroup$ The answer gives another reason to downvote. It's too simple. $\endgroup$
    – newzad
    Jul 9, 2016 at 11:32
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    $\begingroup$ @nikamed, I agree that it is simple, but sometimes the best questions are. Not sure about this one though :\ $\endgroup$ Jul 9, 2016 at 11:33

1 Answer 1

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47, 43, 41, 37, 31, 29, 23, 19, 17, 13, 11, 7 , 5, 3 and 2 in that order

Because

Prime my pump backwards, and you may enter?

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  • $\begingroup$ yup this is right $\endgroup$ Jul 9, 2016 at 11:29
  • 6
    $\begingroup$ Oh, this was a bit simple then $\endgroup$ Jul 9, 2016 at 11:29

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