Smallest number k such that A270172(k) = n.

Terms

a(0) =0a(1) =90a(2) =80a(3) =70a(4) =60a(5) =50a(6) =40a(7) =30a(8) =20a(9) =10a(10) =100a(11) =190a(12) =180a(13) =170a(14) =160a(15) =150a(16) =140a(17) =130a(18) =120a(19) =1010a(20) =1200a(21) =1290a(22) =1280a(23) =1270a(24) =1260a(25) =1250a(26) =1240a(27) =1230a(28) =10120a(29) =12010