Numbers without a prime factor with a digit larger than 1.

Terms

a(0) =1a(1) =11a(2) =101a(3) =121a(4) =1111a(5) =1331a(6) =10111a(7) =10201a(8) =12221a(9) =14641a(10) =101111a(11) =111221a(12) =112211a(13) =134431a(14) =161051a(15) =1011001a(16) =1021211a(17) =1030301a(18) =1100101a(19) =1112221a(20) =1223431a(21) =1234321a(22) =1478741a(23) =1771561a(24) =10010101a(25) =10011101a(26) =10100011a(27) =10101101a(28) =10110011a(29) =10111001