A = 20013 + 20023 + 20033 + 20043 + 20053 + 20063 + 20073 + 20083 + 20093
= ( 2001 + 2002 + 2003 + 2004 + 2005 + 2006 + 2007 + 2008 + 2009 )3
= ( ( 2001 + 2009 ) + ( 2002 + 2008 ) + ( 2003 + 2007 ) + ( 2004 + 2006 ) + 2005 )3
= ( 4010 + 4010 + 4010 + 4010 + 2005 ) 3
= ( 4010 . 4 + 2005 )3
= ( 16040 + 2005 )3
= 180453