a(n) is the nearest integer to the area of a triangle with sides prime(n), prime(n+1), prime(n+2).

Terms

a(0) =0a(1) =6a(2) =13a(3) =38a(4) =71a(5) =108a(6) =159a(7) =218a(8) =317a(9) =436a(10) =550a(11) =697a(12) =817a(13) =961a(14) =1185a(15) =1425a(16) =1667a(17) =1884a(18) =2134a(19) =2377a(20) =2635a(21) =3009a(22) =3438a(23) =3931a(24) =4351a(25) =4645a(26) =4888a(27) =5200a(28) =5778a(29) =6548