Infinite Series Error - Bug?

*To*: mathgroup at smc.vnet.net*Subject*: [mg124543] Infinite Series Error - Bug?*From*: clashton <clashton at gmail.com>*Date*: Tue, 24 Jan 2012 05:06:02 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

Can anyone explain why evaluating the following expression gives an error? Sum[q^(-6 + 4*n)/(1 - q^(-5 + 4*n)), {n, 0, Infinity}] /. {q -> 0.1} None of the denominators are 0 (would only happen if -5 + 4*n=0, which is impossible for an integer n, yet I get an error message "Infinite expression 1/0 encountered" (several times in fact). Any help on a work around greatly appreciated. (Please reply to my personal e-mail also). Thanks, Jimmy

**Follow-Ups**:**Re: Infinite Series Error - Bug?***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: Infinite Series Error - Bug?***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Infinite Series Error - Bug?***From:*DrMajorBob <btreat1@austin.rr.com>