Numbers k such that the square of k contains sigma(k) as a substring, in base 10.

Terms

a(0) =1a(1) =11a(2) =101a(3) =125a(4) =153a(5) =1205a(6) =1502a(7) =1810a(8) =3080a(9) =7631a(10) =18010a(11) =18650a(12) =21020a(13) =36559a(14) =36911a(15) =44805a(16) =53999a(17) =60541a(18) =68443a(19) =120005a(20) =189585a(21) =210020a(22) =487195a(23) =1059449a(24) =1750004a(25) =1800010a(26) =1860050a(27) =1872250a(28) =2072139a(29) =2170100