Composite numbers whose prime factors contain no digits other than 0 and 1.

Terms

a(0) =121a(1) =1111a(2) =1331a(3) =10201a(4) =12221a(5) =14641a(6) =111221a(7) =112211a(8) =134431a(9) =161051a(10) =1021211a(11) =1030301a(12) =1112221a(13) =1223431a(14) =1234321a(15) =1478741a(16) =1771561a(17) =10212211a(18) =11121011a(19) =11233321a(20) =11333311a(21) =12101111a(22) =12234431a(23) =13457741a(24) =13577531a(25) =16266151