OFFSET
1,1
MATHEMATICA
Select[Range[100], Length[Union[IntegerDigits[#, 8]]]==2&] (* Harvey P. Dale, Feb 15 2019 *)
PROG
(PARI) is(n)=#Set(digits(n, 8))==2 \\ Charles R Greathouse IV, Feb 15 2017
(Python)
def ok(n): return len(set(oct(n)[2:])) == 2
print(list(filter(ok, range(106)))) # Michael S. Branicky, Aug 10 2021
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
EXTENSIONS
Name edited by Michael S. Branicky, Aug 10 2021
STATUS
approved