# Biblatex no printing “p.” when page number ends in some letters

Using biblatex.sty 2013/01/10 v2.5 and biber version: 1.5, given

\documentclass{article}
\usepackage{biblatex}

\begin{document}
\nocite{*}
\printbibliography
\end{document}


and the .bib file

@Article{A,
author =       {Some author},
title =        {Some title},
journal =      {Some journal},
year =         2013,
pages =        {1A}
}


the page number is generated as '1A' instead of 'p. 1A'.

Note 1: The same happens if I replace the 'A' in '1A' by some letter not belonging to Roman numerals, i.e. I, V, X, L, C, D or M.

Note 2: The same happens if I replace the biber backend by the bibtex one.

Note 3: If I remove biblatex and I use bibtex instead, I got the right result.

biblatex uses the command \mkpageprefix to print the page numbers. Internal this command checks whether the input is a number or not. This is done by \ifnumeral:

In the documentation you can find the following explanation:

\ifnumeral{⟨string⟩}{⟨true⟩}{⟨false⟩}


Executes ⟨true⟩ if the ⟨string⟩ is an Arabic or Roman numeral, and ⟨false⟩ otherwise. This command is robust. See also \DeclareNumChars and \NumCheckSetup in § 4.6.4.

The token A isn't an arabic nor an roman numeral. As described you can add this token by \DeclareNumChars

\documentclass{article}
\usepackage{biblatex}
\DeclareNumChars{A}
\usepackage{filecontents}
\begin{filecontents}{pages.bib}
@Article{A,
author =       {Some author},
title =        {Some title},
journal =      {Some journal},
year =         2013,
pages =        {1A}
}
\end{filecontents}