[R] Find sequence in vector

[ens]

> a<-sample(1:6,100,replace=T)
> a
  [1] 2 4 3 4 5 1 3 2 4 3 6 6 2 6 2 1 5 5 3 4 6 1 6 6 3 4 6 6 4 4 5 4 6 5 6
3 4 5 6 3 4 1 6 6 6 4 2 1 1 3 1 5 3 2 2 6 2 5
 [59] 2 6 1 6 1 1 6 4 4 2 2 3 4 5 6 1 6 4 6 1 5 1 1 2 1 3 4 4 6 3 1 4 1 1 1
5 5 2 4 6 5 1
which(a<=3)
 [1]   1   3   6   7   8  10  13  15  16  19  22  25  36  40  42  47  48  49 
50  51  53  54  55  57  59  61  63  64  68
[30]  69  70  74  78  80  81  82  83  84  88  89  91  92  93  96 100

I want to know if the indices are sequential and if so, how many of them are
sequential in a row. Does anyone know the least clumsy way to do this. I am
a C++ user by default, so my instinct is probably too mess for R.

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