OFFSET
1,1
COMMENTS
If k is in the sequence, then so are 4*k+1 and 4*k+3 but not 4*k or 4*k+2. - Robert Israel, Jan 19 2023
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
MAPLE
filter:= proc(n) local L; L:= convert(n, base, 4);
not member(2, L) and numboccur(0, L)=2
end proc:
select(filter, [$1..1000]); # Robert Israel, Jan 19 2023
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved