Numbers k such that 2^k does not contain the digit 2 (probably finite).

Terms

a(0) =0a(1) =2a(2) =3a(3) =4a(4) =6a(5) =12a(6) =14a(7) =16a(8) =20a(9) =22a(10) =23a(11) =26a(12) =34a(13) =35a(14) =36a(15) =39a(16) =42a(17) =46a(18) =54a(19) =64a(20) =74a(21) =83a(22) =168