Numbers k such that k-1 is a substring of k^2.

Terms

a(0) =9a(1) =37a(2) =99a(3) =370a(4) =999a(5) =3367a(6) =9999a(7) =22186a(8) =99999a(9) =221860a(10) =333667a(11) =625001a(12) =625009a(13) =859415a(14) =926968a(15) =999999a(16) =1507152a(17) =3125001a(18) =3701562a(19) =7012141a(20) =9375009a(21) =9999999a(22) =20506249a(23) =28658098a(24) =33336667a(25) =46875009a(26) =78125001a(27) =79632152a(28) =86609391a(29) =98089448