Spiral sieve using Fibonacci numbers.

Terms

a(0) =1a(1) =3a(2) =6a(3) =8a(4) =9a(5) =17a(6) =25a(7) =28a(8) =79a(9) =119a(10) =132a(11) =281a(12) =437a(13) =586a(14) =1083a(15) =1557a(16) =2534a(17) =4117a(18) =6683a(19) =10842a(20) =18113a(21) =29167a(22) =47016a(23) =74751a(24) =121045a(25) =197750a(26) =317247a(27) =516383a(28) =831128a(29) =1345109