a(0) = 3, then a(n) is the least prime greater than a(n-1) that follows a gap of exactly 2*n.

Terms

a(0) =3a(1) =5a(2) =11a(3) =29a(4) =97a(5) =149a(6) =211a(7) =307a(8) =1847a(9) =1931a(10) =3109a(11) =3251a(12) =4201a(13) =5557a(14) =5981a(15) =6521a(16) =10831a(17) =11777a(18) =12889a(19) =30631a(20) =33287a(21) =35023a(22) =36433a(23) =81509a(24) =86677a(25) =95701a(26) =103289a(27) =106087a(28) =153247a(29) =181361