Spiral sieve using Fibonacci numbers.

Terms

a(0) =1a(1) =3a(2) =5a(3) =6a(4) =8a(5) =17a(6) =25a(7) =34a(8) =67a(9) =103a(10) =134a(11) =265a(12) =405a(13) =616a(14) =1031a(15) =1565a(16) =2568a(17) =4205a(18) =6603a(19) =11000a(20) =18069a(21) =28975a(22) =46730a(23) =74855a(24) =120469a(25) =197412a(26) =317819a(27) =516103a(28) =830538a(29) =1343773