Spiral sieve using Fibonacci numbers.

Terms

a(0) =1a(1) =2a(2) =5a(3) =7a(4) =8a(5) =13a(6) =21a(7) =40a(8) =75a(9) =113a(10) =146a(11) =281a(12) =425a(13) =544a(14) =1063a(15) =1605a(16) =2418a(17) =4013a(18) =6685a(19) =10688a(20) =18203a(21) =29145a(22) =46946a(23) =75129a(24) =120817a(25) =197856a(26) =318383a(27) =516821a(28) =831450a(29) =1344933