Lucas numbers that are not the sum of two squares.

Terms

a(0) =3a(1) =7a(2) =11a(3) =47a(4) =76a(5) =123a(6) =199a(7) =322a(8) =843a(9) =1364a(10) =2207a(11) =3571a(12) =5778a(13) =15127a(14) =24476a(15) =39603a(16) =64079a(17) =103682a(18) =167761a(19) =271443a(20) =439204a(21) =710647a(22) =1149851a(23) =4870847a(24) =7881196a(25) =12752043a(26) =20633239a(27) =33385282a(28) =87403803a(29) =141422324