A078242 - OEIS

%I #20 Jul 19 2016 10:49:37

%S 3,30,3,300,30,30,3003,3000,333,30,33,300,3003,30030,30,30000,33303,

%T 3330,33003,300,3003,330,330303,3000,300,30030,333333333,300300,

%U 3303303,30,333033,300000,33,333030,30030,33300,333,330030,3003,3000,33333

%N Smallest multiple of n using only digits 0 and 3.

%C a(n) = min{A169966(k): k > 1 and A169966(k) mod n = 0}. - _Reinhard Zumkeller_, Jan 10 2012

%H Reinhard Zumkeller and Chai Wah Wu, <a href="/A078242/b078242.txt">Table of n, a(n) for n = 1..10000</a> First 1000 terms from Reinhard Zumkeller

%o (Haskell)

%o a078242 n = head [x | x <- tail a169966_list, mod x n == 0]

%o -- _Reinhard Zumkeller_, Jan 10 2012

%o (Python)

%o def A078242(n):

%o ....if n > 0:

%o ........for i in range(1,2**n):

%o ............x = 3*int(bin(i)[2:])

%o ............if not x % n:

%o ................return x

%o ....return 0 # _Chai Wah Wu_, Dec 31 2014

%Y Cf. A004290, A078241-A078248, A079339, A096681-A096688.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Nov 23 2002

%E More terms from _Ray Chandler_, Jul 12 2004