Primitive numbers in A229307.

Terms

a(0) =3a(1) =10a(2) =55a(3) =136a(4) =253a(5) =406a(6) =1081a(7) =1378a(8) =1711a(9) =2485a(10) =3403a(11) =3916a(12) =5671a(13) =6328a(14) =8515a(15) =9316a(16) =11026a(17) =13861a(18) =14878a(19) =15931a(20) =18145a(21) =19306a(22) =25651a(23) =27028a(24) =28441a(25) =31375a(26) =32896a(27) =34453a(28) =36046a(29) =42778