login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A117121 Numbers k for which none of the digits of k appear in the decimal expansion of 1/k. 1

%I #13 Mar 24 2021 08:06:51

%S 2,4,5,8,9,11,12,15,18,22,25,36,39,44,45,55,66,72,74,75,88,99,111,125,

%T 132,135,148,182,198,222,225,239,259,264,271,275,296,351,369,375,378,

%U 396,399,444,455,478,481,495,525,555,585,666,675,876,888,925,984

%N Numbers k for which none of the digits of k appear in the decimal expansion of 1/k.

%H Amiram Eldar, <a href="/A117121/b117121.txt">Table of n, a(n) for n = 1..192</a>

%e 39 is in the sequence because in the decimal expansion of 1/39 = 0.02564102564102564... there are no 3's and 9's.

%e 167 is not in the sequence because the decimal expansion of 1/167 = 0.005988023952095808383233532934131736... includes 1, 6 and 7.

%t q[n_] := Module[{r = RealDigits[1/n], d = IntegerDigits[n]}, If[r[[2]] < 0, ! MemberQ[d, 0], True] && !IntersectingQ[d, Flatten@r[[1]]]]; Select[Range[1000], q] (* _Amiram Eldar_, Mar 24 2021 *)

%Y Subsequence of A052382.

%Y A002275 \ {0, 1} is a subsequence.

%K base,nonn

%O 1,1

%A Luc Stevens (lms022(AT)yahoo.com), Apr 19 2006

%E Corrected by _T. D. Noe_, Nov 01 2006

%E Offset corrected and a wrong term (167) removed by _Amiram Eldar_, Mar 24 2021

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 11:46 EDT 2024. Contains 371241 sequences. (Running on oeis4.)