A035060 Numbers k such that 2^k does not contain the digit 5 (probably finite).

0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 18, 22, 23, 24, 26, 27, 30, 31, 32, 34, 36, 38, 43, 46, 55, 62, 65, 66, 71

Offset: 1

Author

Patrick De Geest, Nov 15 1998

Keywords

• nonn
• base

Crossrefs

Cf. similar sequences listed in A035064.

Programs

Magma

[n: n in [0..1000] | not 5 in Intseq(2^n) ]; // Vincenzo Librandi, May 07 2015

Mathematica

Join[{0}, Select[Range@10000, FreeQ[IntegerDigits[2^#], 5] &]] (* Vincenzo Librandi, May 07 2015 *)
Select[Range[0,80],DigitCount[2^#,10,5]==0&] (* Harvey P. Dale, Dec 24 2018 *)

Extensions

Initial 0 inserted by Vincenzo Librandi, May 07 2015