Numbers k such that k is a substring of its base-3 representation.

Terms

a(0) =0a(1) =1a(2) =2a(3) =10a(4) =20a(5) =21a(6) =102a(7) =110a(8) =210a(9) =211a(10) =212a(11) =220a(12) =1011a(13) =1112a(14) =1121a(15) =2022a(16) =12101a(17) =12102a(18) =12112a(19) =12122a(20) =10121021a(21) =10121022a(22) =12222212a(23) =102121110a(24) =102121120a(25) =200121022a(26) =1001120220a(27) =2011001102a(28) =2012012221a(29) =2100221021