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A039403 Numbers whose base-10 representation has the same nonzero number of 1's and 3's. 0

%I

%S 13,31,103,123,130,132,134,135,136,137,138,139,143,153,163,173,183,

%T 193,213,231,301,310,312,314,315,316,317,318,319,321,341,351,361,371,

%U 381,391,413,431,513,531,613,631,713,731,813,831,913,931,1003,1023

%N Numbers whose base-10 representation has the same nonzero number of 1's and 3's.

%t Select[Range[1100],DigitCount[#,10,1]==DigitCount[#,10,3]>0&] (* _Harvey P. Dale_, May 09 2019 *)

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_

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Last modified August 16 05:55 EDT 2022. Contains 356160 sequences. (Running on oeis4.)