Giza nonprimes.

Terms

a(0) =1a(1) =4a(2) =6a(3) =8a(4) =9a(5) =121a(6) =232a(7) =343a(8) =454a(9) =565a(10) =676a(11) =898a(12) =12321a(13) =23432a(14) =45654a(15) =56765a(16) =67876a(17) =78987a(18) =1234321a(19) =2345432a(20) =3456543a(21) =4567654a(22) =5678765a(23) =6789876a(24) =123454321a(25) =234565432a(26) =456787654a(27) =567898765a(28) =12345654321a(29) =23456765432