The positions of zeros in A163898 and A163899.

Terms

a(0) =0a(1) =1a(2) =10a(3) =21a(4) =28a(5) =136a(6) =171a(7) =190a(8) =300a(9) =325a(10) =406a(11) =465a(12) =496a(13) =2080a(14) =2211a(15) =2278a(16) =2628a(17) =2701a(18) =2926a(19) =3081a(20) =3160a(21) =4656a(22) =4753a(23) =5050a(24) =5253a(25) =5356a(26) =6328a(27) =6555a(28) =6670a(29) =7260