Prime number spiral (clockwise, Southeast spoke).

Terms

a(0) =2a(1) =11a(2) =59a(3) =157a(4) =313a(5) =547a(6) =829a(7) =1201a(8) =1621a(9) =2153a(10) =2749a(11) =3463a(12) =4217a(13) =5059a(14) =6011a(15) =7001a(16) =8167a(17) =9343a(18) =10631a(19) =12071a(20) =13513a(21) =15107a(22) =16759a(23) =18481a(24) =20399a(25) =22343a(26) =24371a(27) =26591a(28) =28807a(29) =31231