Positive integers A270710(k) (= (k+1)*(3*k-1)) which have only 1 or 2 different digits in base 10.

Terms

a(0) =4a(1) =15a(2) =32a(3) =55a(4) =84a(5) =119a(6) =455a(7) =799a(8) =900a(9) =3332a(10) =3535a(11) =7007a(12) =8855a(13) =244244a(14) =333332a(15) =335335a(16) =400404a(17) =445444a(18) =555559a(19) =666464a(20) =799799a(21) =1999199a(22) =3303300a(23) =33333332a(24) =33353335a(25) =3333333332a(26) =3333533335a(27) =333333333332a(28) =333335333335a(29) =700007077007