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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 '16 at 11:29
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    $\begingroup$ @nikamed how so? the logic of the question takes in only 1 valid answer $\endgroup$ – Adit Kirtani Jul 9 '16 at 11:30
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    $\begingroup$ @nikamed, the answer by Beastly Gerbil shows a very simple solution $\endgroup$ – user20998 Jul 9 '16 at 11:31
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    $\begingroup$ The answer gives another reason to downvote. It's too simple. $\endgroup$ – newzad Jul 9 '16 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 :\ $\endgroup$ – Beastly Gerbil Jul 9 '16 at 11:33
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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 $\endgroup$ – Adit Kirtani Jul 9 '16 at 11:29
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    $\begingroup$ Oh, this was a bit simple then $\endgroup$ – Beastly Gerbil Jul 9 '16 at 11:29

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