Squarefree sums of two squares; or squarefree numbers with no prime factors of the form 4k+3.

Terms

a(0) =1a(1) =2a(2) =5a(3) =10a(4) =13a(5) =17a(6) =26a(7) =29a(8) =34a(9) =37a(10) =41a(11) =53a(12) =58a(13) =61a(14) =65a(15) =73a(16) =74a(17) =82a(18) =85a(19) =89a(20) =97a(21) =101a(22) =106a(23) =109a(24) =113a(25) =122a(26) =130a(27) =137a(28) =145a(29) =146