Numbers whose decimal expansion is a concatenation of 3 consecutive decreasing numbers.

Terms

a(0) =210a(1) =321a(2) =432a(3) =543a(4) =654a(5) =765a(6) =876a(7) =987a(8) =1098a(9) =11109a(10) =121110a(11) =131211a(12) =141312a(13) =151413a(14) =161514a(15) =171615a(16) =181716a(17) =191817a(18) =201918a(19) =212019a(20) =222120a(21) =232221a(22) =242322a(23) =252423a(24) =262524a(25) =272625a(26) =282726a(27) =292827a(28) =302928a(29) =313029