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

1,3

Links

Table of n, a(n) for n=1..34.

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 *)

Prog

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

Crossrefs

Cf. similar sequences listed in A035064.

Sequence in context: A031492 A350076 A379396 * A231272 A143719 A078779

Adjacent sequences: A035057 A035058 A035059 * A035061 A035062 A035063

Keyword

nonn,base

Author

Patrick De Geest, Nov 15 1998

Extensions

Initial 0 inserted by Vincenzo Librandi, May 07 2015

Status

approved