Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Almost all palindromes are composite   We study the distribution of palindromic numbers (with respect to a fixed
base $g\ge 2$) over certain congruence classes, and we derive a nontrivial
upper bound for the number of prime palindromes $n\le x$ as $x\to\infty$. Our
results show that almost all palindromes in a given base are composite.

7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ