Number of twin prime pairs < square of n-th prime.

Terms

a(0) =0a(1) =2a(2) =4a(3) =6a(4) =10a(5) =12a(6) =19a(7) =21a(8) =25a(9) =33a(10) =35a(11) =46a(12) =53a(13) =56a(14) =67a(15) =80a(16) =93a(17) =98a(18) =117a(19) =128a(20) =131a(21) =146a(22) =160a(23) =174a(24) =195a(25) =210a(26) =217a(27) =227a(28) =233a(29) =244