Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On primitive divisors of n^2+b   We study primitive divisors of terms of the sequence P_n=n^2+b, for a fixed
integer b which is not a negative square. It seems likely that the number of
terms with a primitive divisor has a natural density. This seems to be a
difficult problem. We survey some results about divisors of this sequence as
well as provide upper and lower growth estimates for the number of terms which
have a primitive divisor.

14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph