). ▁ ▁The ▁project ▁proceed s ▁in ▁the ▁same ▁way ▁as ▁other ▁prime - h un ting ▁projects ▁like ▁G I MP S ▁or ▁Se vent een ▁or ▁B ust : ▁sie ving ▁elimin ates ▁pairs ▁( k , ▁n ) ▁with ▁small ▁factors , ▁and ▁then ▁a ▁determin istic ▁test , ▁in ▁this ▁case ▁the ▁Lucas - Le h mer - R ies el ▁test ▁based ▁on ▁the ▁Lucas - Le h mer ▁test , ▁is ▁used ▁to ▁check ▁prim ality ▁of ▁numbers ▁without ▁small ▁factors . ▁ ▁Users ▁can ▁choose ▁whether ▁to ▁s ieve ▁or ▁to ▁run ▁LL R ▁tests ▁on ▁candidates ▁sie ved ▁by ▁other ▁users ; ▁heavily - optim ised ▁sie ving ▁software ▁is ▁available . ▁ ▁R ies el ▁S ieve ▁maintain s ▁lists ▁of ▁the ▁pr imes ▁that ▁have ▁been ▁found ▁and ▁the ▁k ▁whose ▁status ▁is ▁still ▁unknown . ▁ ▁From ▁ 2 0 1 0 ▁on ward , ▁the ▁investigation ▁has ▁been ▁taken ▁over ▁by ▁another ▁distributed ▁computing ▁project , ▁Prime Grid . ▁ ▁References ▁ ▁External ▁links ▁The ▁official ▁R ies el ▁S ieve ▁home ▁page ▁( R ies el ▁S ieve ▁is ▁now ▁part ▁of ▁Prim eg rid ) ▁Definition ▁and ▁status ▁of ▁the ▁problem ▁ ▁Category : Ber keley ▁Open ▁In frastr ucture ▁for ▁Network ▁Comput ing ▁projects ▁Category : Pr ime ▁numbers ▁Category : Ex perimental ▁mathematics <0x0A> </s> ▁H ip Nav ▁was ▁the ▁first ▁computer - ass isted ▁surg ery ▁system ▁developed ▁to ▁guide ▁the ▁sur geon ▁during ▁total ▁hip