Least k such that A033178(k)=n.

Terms

a(0) =2a(1) =7a(2) =5a(3) =13a(4) =25a(5) =37a(6) =41a(7) =89a(8) =61a(9) =85a(10) =113a(11) =221a(12) =253a(13) =281a(14) =181a(15) =361a(16) =421a(17) =433a(18) =761a(19) =841a(20) =613a(21) =793a(22) =1009a(23) =1541a(24) =1201a(25) =1901a(26) =1121a(27) =1261a(28) =2801a(29) =2881