Hi, Re Reply: The sum needs to be calculated. p1 + p2 + p3 + p4....pn >2007 where p1 =1 Below is a partial listing of 50 Prime Numbers (51 including 1) p1 + p2 + p3 + p4....p35 > 2007 Adding those thru p35 = 139 gives a sum >2007 (2128) Adding those thru pn where n > 34 gives a sum >2007 1 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 ...