<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi everyone,<div>I have the following 64 bits prime number of unsigned long <span style="color: rgb(39, 42, 216); font-family: Menlo; font-size: 11px;">18211888930494588812</span><span style="font-family: Menlo; font-size: 11px;">LU, I use it as the modulus of the ZZ_p field. </span></div><div><font face="Menlo"><span style="font-size: 11px;">when I try to parse using the conv function 64 bit numbers the conversion treats my numbers as signed longs (hence negative), placing the value elsewhere in the field:</span></font></div><div><font face="Menlo"><span style="font-size: 11px;">Ex.</span></font></div><div><font face="Menlo"><span style="font-size: 11px;">conv<ZZ_p>(</span></font><span style="color: rgb(39, 42, 216); font-family: Menlo; font-size: 11px;">18211888930494588809</span><span style="font-family: Menlo; font-size: 11px;">LU</span><span style="font-size: 11px; font-family: Menlo;">) yields: </span><span style="font-family: Menlo; font-size: 11px;"><font color="#0061ff">17977033787279626007</font>.</span></div><div><span style="font-family: Menlo; font-size: 11px;">when the correct answer is: </span><span style="color: rgb(39, 42, 216); font-family: Menlo; font-size: 11px;">18211888930494588809</span></div><div><font face="Menlo"><span style="font-size: 11px;">to manage make it work I have to do the following<font color="#272ad8"> </font></span></font><span style="font-family: Menlo; font-size: 11px;">conv<ZZ_p>(</span><span style="font-family: Menlo; font-size: 11px;">conv<ZZ>(</span><span style="color: rgb(39, 42, 216); font-family: Menlo; font-size: 11px;">18211888930494588809LU</span><span style="font-family: Menlo; font-size: 11px;">)</span><span style="font-family: Menlo; font-size: 11px;">)</span></div><div><font face="Menlo"><span style="font-size: 11px;">Is there something I’m doing incorrectly?</span></font></div><div><font face="Menlo"><span style="font-size: 11px;"><br></span></font></div><div><font face="Menlo"><span style="font-size: 11px;">thanks in advance,</span></font></div><div><font face="Menlo"><span style="font-size: 11px;"><br></span></font></div><div><font face="Menlo"><span style="font-size: 11px;">Abdelrahaman Aly<span class="Apple-tab-span" style="white-space:pre"> </span></span></font></div><div><font face="Menlo">PhD Student</font></div><div><font face="Menlo">UCLouvain-CORE</font></div></body></html>