What is the number 2002 of sequence 3,48,1,5,49,4,7,50,7,9,51,10,11?

What is the number 2002 of sequence 3,48,1,5,49,4,7,50,7,9,51,10,11?

You can split this sequence into three
3,48,1,
5,49,4,
7,50,7,
Observe the law of the column
By analogy, 2002 / 3 = 667 one
In other words, in the first column, the company in the first column is a = 1 + 2n,
2002, n = 668, so the answer is 1337