Partial sums of circular primes A016114.

Terms

a(0) =2a(1) =5a(2) =10a(3) =17a(4) =28a(5) =41a(6) =58a(7) =95a(8) =174a(9) =287a(10) =484a(11) =683a(12) =1020a(13) =2213a(14) =5992a(15) =17931a(16) =37868a(17) =231807a(18) =431740