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URL: https://oeis.org/A033035

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A033035
Numbers such that all base 9 digits are odd.
5
1, 3, 5, 7, 10, 12, 14, 16, 28, 30, 32, 34, 46, 48, 50, 52, 64, 66, 68, 70, 91, 93, 95, 97, 109, 111, 113, 115, 127, 129, 131, 133, 145, 147, 149, 151, 253, 255, 257, 259, 271, 273, 275, 277, 289, 291, 293, 295, 307, 309, 311, 313, 415
OFFSET
1,2
LINKS
FORMULA
a(4n+j) = 9*a(n)+2*j-1 for j=1..4. - Robert Israel, Jan 23 2019
MAPLE
f:= proc(n) option remember; local m;
m:= floor((n-1)/4);
9*procname(m) + 2*n - 8*m - 1
end proc:
f(0):= 0:
map(f, [$1..100]); # Robert Israel, Jan 23 2019
MATHEMATICA
Select[Range[500], AllTrue[IntegerDigits[#, 9], OddQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Oct 14 2015 *)
Flatten[Table[FromDigits[#, 9]&/@Tuples[Range[1, 7, 2], n], {n, 3}]] (* Harvey P. Dale, Jun 13 2020 *)
CROSSREFS
Cf. A007095 (numbers in base 9).
Sequence in context: A184586 A190511 A260466 * A047390 A184653 A263085
KEYWORD
nonn,base
STATUS
approved