Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic palindromic numbers   We introduce a notion of palindromicity of a natural number which is
independent of the base. We study the existence and density of palindromic and
multiple palindromic numbers, and we raise several related questions.

37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an