Numbers of the form prime(i-1)+prime(i+1) that are the average of a twin prime pair.

Terms

a(0) =72a(1) =150a(2) =180a(3) =270a(4) =1032a(5) =1062a(6) =1452a(7) =1608a(8) =2028a(9) =2082a(10) =2130a(11) =2592a(12) =2790a(13) =3120a(14) =3258a(15) =3300a(16) =3360a(17) =3930a(18) =4020a(19) =4272a(20) =4650a(21) =4722a(22) =4788a(23) =4932a(24) =5442a(25) =5880a(26) =6702a(27) =7128a(28) =7332a(29) =7878