Prime number spiral (clockwise, North spoke).

Terms

a(0) =2a(1) =3a(2) =31a(3) =107a(4) =241a(5) =443a(6) =709a(7) =1049a(8) =1471a(9) =1973a(10) =2539a(11) =3191a(12) =3911a(13) =4729a(14) =5651a(15) =6637a(16) =7699a(17) =8867a(18) =10133a(19) =11503a(20) =12941a(21) =14537a(22) =16073a(23) =17863a(24) =19727a(25) =21601a(26) =23609a(27) =25759a(28) =27967a(29) =30319