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 A169966 Numbers whose decimal expansion contains only 0's and 3's. 12
 0, 3, 30, 33, 300, 303, 330, 333, 3000, 3003, 3030, 3033, 3300, 3303, 3330, 3333, 30000, 30003, 30030, 30033, 30300, 30303, 30330, 30333, 33000, 33003, 33030, 33033, 33300, 33303, 33330, 33333, 300000, 300003, 300030, 300033, 300300, 300303, 300330, 300333 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 FORMULA a(n+1)=Sum_ k>=0 {A030308(n,k)*A093138(k+1)}. - From Philippe Deléham, Oct 16 2011. a(n) = 3 * A007088(n-1). PROG (PARI) print1(0); for(d=1, 5, for(n=2^(d-1), 2^d-1, print1(", "); forstep(i=d-1, 0, -1, print1((n>>i)%2*3)))) \\ Charles R Greathouse IV, Nov 16 2011 (Haskell) a169966 n = a169966_list !! (n-1) a169966_list = map (* 3) a007088_list -- Reinhard Zumkeller, Jan 10 2012 CROSSREFS Cf. A007088, A014263, A169964, A169965, A169967. Cf. A078242, A204093, A204094, A204095, A097256. Sequence in context: A045863 A121023 A124520 * A140153 A095045 A061472 Adjacent sequences:  A169963 A169964 A169965 * A169967 A169968 A169969 KEYWORD nonn,base,easy AUTHOR N. J. A. Sloane, Aug 07 2010 STATUS approved

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Last modified January 17 19:58 EST 2019. Contains 319251 sequences. (Running on oeis4.)