R: How to find non-sequential elements in an array -

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I have an array of numbers in it and I do not already know what the number will be. I want to separate which are not sequential to the previous number (except for the first number in the sequence).

For example: array: 2 3 4 5 10 11 12 15 18 19 20 23 24

I would like to return 2 10 15 < / P>

-text "itemprop =" text ">

Try 

  v1 & lt; -c (2: 5,10: 12,15, 18:20, 23:24) v1 [c (TRUE, diff (v1) = 1 )] # [1] 2 10 15 18 23  
 update  
 If you want to get the final sequential number, try  
 < Code> v1 [c (diff (v1)! = 1, TRUE)] # [1] 5 12 15 20 24

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