The position of the first n in A339895.

Terms

a(0) =1a(1) =8a(2) =27a(3) =54a(4) =162a(5) =343a(6) =961a(7) =1369a(8) =1849a(9) =2809a(10) =3721a(11) =4489a(12) =5329a(13) =6889a(14) =7921a(15) =10201a(16) =11449a(17) =12769a(18) =16129a(19) =18769a(20) =22201a(21) =22801a(22) =26569a(23) =29929a(24) =32761a(25) =36481a(26) =38809a(27) =44521a(28) =49729a(29) =52441