Prime number spiral (clockwise, West spoke).

Terms

a(0) =2a(1) =19a(2) =83a(3) =199a(4) =389a(5) =641a(6) =967a(7) =1361a(8) =1823a(9) =2377a(10) =3001a(11) =3709a(12) =4517a(13) =5419a(14) =6353a(15) =7477a(16) =8623a(17) =9791a(18) =11159a(19) =12577a(20) =14083a(21) =15667a(22) =17417a(23) =19273a(24) =21149a(25) =23063a(26) =25229a(27) =27431a(28) =29683a(29) =32183