1/4 + 1/8 +1/32 + (1/2)^7 + (1/2)^11 + (1/2)^13 + (1/2)^17 + (1/2)^19 + (1/2)^23 + (1/2)^29 + (1/2)^31 + (1/2)^37 + (1/2)^41 + (1/2)^43 + (1/2)^47 + (1/2)^53 + (1/2)^59 + (1/2)^61 + (1/2)^67