Smallest number whose cube begins and ends in n, or 0 if no such number exists.

Terms

a(0) =0a(1) =1a(2) =28a(3) =7a(4) =74a(5) =175a(6) =86a(7) =43a(8) =2a(9) =99a(10) =0a(11) =2271a(12) =108a(13) =517a(14) =0a(15) =0a(16) =256a(17) =2573a(18) =0a(19) =1239a(20) =0a(21) =12841a(22) =0a(23) =2847a(24) =624a(25) =1365a(26) =0a(27) =3a(28) =1412a(29) =309