a(n) = Sum_{k=1..n} k*(prime(k) - k).

Terms

a(0) =1a(1) =4a(2) =16a(3) =40a(4) =110a(5) =182a(6) =336a(7) =480a(8) =750a(9) =1210a(10) =1540a(11) =2236a(12) =2912a(13) =3500a(14) =4400a(15) =5712a(16) =7242a(17) =8322a(18) =10260a(19) =12040a(20) =13552a(21) =16192a(22) =18584a(23) =21800a(24) =26000a(25) =29250a(26) =32004a(27) =35728a(28) =38860a(29) =43090