Number of points of rotation in a prime block spiral.

Terms

a(0) =2a(1) =3a(2) =5a(3) =11a(4) =17a(5) =29a(6) =41a(7) =59a(8) =73a(9) =101a(10) =127a(11) =157a(12) =191a(13) =229a(14) =269a(15) =313a(16) =367a(17) =421a(18) =467a(19) =547a(20) =607a(21) =673a(22) =751a(23) =829a(24) =919a(25) =1013a(26) =1093a(27) =1201a(28) =1297a(29) =1429