OFFSET
1,1
LINKS
EXAMPLE
315 = 7*45 is a term as it contains only odd digits.
MAPLE
R:= NULL:
for d from 1 to 4 do
for n from 5^d to 2*5^d-1 do
L:= map(t -> 2*t+1, convert(n, base, 5)[1..d]);
x:= add(L[i]*10^(i-1), i=1..nops(L));
if x mod 7 = 0 then
R:= R, x;
fi;
od od:
R; # Robert Israel, Nov 02 2019
MATHEMATICA
Select[7*Range[500], Count[IntegerDigits[#], _?EvenQ]==0&] (* Harvey P. Dale, Jun 13 2011 *)
PROG
(PARI) is(n)=n%7==0 && #setintersect(Set(digits(n)), [0, 2, 4, 6, 8])==0 \\ Charles R Greathouse IV, Feb 15 2017
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Amarnath Murthy, May 28 2001
EXTENSIONS
More terms from Larry Reeves (larryr(AT)acm.org), May 30 2001
STATUS
approved