a(n)=least k such that s(k)=n, where s=A030757.

Terms

a(0) =1a(1) =7a(2) =3a(3) =5a(4) =17a(5) =8a(6) =35a(7) =13a(8) =45a(9) =34a(10) =19a(11) =46a(12) =27a(13) =61a(14) =95a(15) =36a(16) =164a(17) =48a(18) =97a(19) =141a(20) =96a(21) =63a(22) =196a(23) =118a(24) =80a(25) =303a(26) =142a(27) =98a(28) =169a(29) =120