Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recurrent Relations for Multiple of Triangular Numbers being Triangular
  Numbers   We search for triangular numbers that are multiples of other triangular
numbers. It is found that for any positive non-square integer multiplier, there
is an infinity of multiples of triangular numbers that are triangular numbers
and recurrent relations are deduced theoretically. If the multiplier is a
squared integer, there is either one or no solution, depending on the
multiplier value.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc