start with 2011/11=183=first ges at middel
look at list av primes & yu find 181 & 191 as primes neer this point
tri 181...add in 5 in front & 5 behind 181
5 in front=157, 163,167,173,179...sum=839
5 after=191,193,197,199,211...sum=991
839+181+991=2011