OFFSET
1,3
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
filter:= proc(n) local L;
L:= convert(n, base, 7);
numboccur(3, L)=numboccur(4, L)
end proc:
select(filter, [$0..1000]); # Robert Israel, Feb 01 2021
MATHEMATICA
Select[Range[0, 200], DigitCount[#, 7, 3]==DigitCount[#, 7, 4]&] (* Harvey P. Dale, Feb 07 2019 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved