A061825 Multiples of 7 containing only odd digits.
7, 35, 77, 91, 119, 133, 175, 315, 357, 371, 399, 511, 539, 553, 595, 735, 777, 791, 917, 931, 959, 973, 1113, 1155, 1197, 1337, 1351, 1379, 1393, 1519, 1533, 1575, 1715, 1757, 1771, 1799, 1911, 1939, 1953, 1995, 3115, 3157, 3171, 3199, 3311, 3339
Offset: 1
Examples
315 = 7*45 is a term as it contains only odd digits.
Links
Programs
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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 *)
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PARI
is(n)=n%7==0 && #setintersect(Set(digits(n)), [0,2,4,6,8])==0 \\ Charles R Greathouse IV, Feb 15 2017
Extensions
More terms from Larry Reeves (larryr(AT)acm.org), May 30 2001