According to a letter that the Journal received as an attachment to an email dated September 27, 2011 from the senior author Prof. Ashoke Ranjan Thakur, they have indicated to have their paper retracted, because an original reviewer raised questions (when he saw the published copy) regarding the correctness assignment of a residue number in their calculation. The authors have already started the recalculation. They intend to submit the whole paper back again for consideration for publication in a future issue of the Journal.