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A199985 Numbers with digital product = 5. 3

%I #14 Jan 13 2021 17:57:20

%S 5,15,51,115,151,511,1115,1151,1511,5111,11115,11151,11511,15111,

%T 51111,111115,111151,111511,115111,151111,511111,1111115,1111151,

%U 1111511,1115111,1151111,1511111,5111111,11111115,11111151,11111511,11115111,11151111,11511111

%N Numbers with digital product = 5.

%C Subsequence of A034052.

%H Harvey P. Dale, <a href="/A199985/b199985.txt">Table of n, a(n) for n = 1..10000</a>

%p f:= proc(d) local b,i;

%p b:= (10^d-1)/9;

%p seq(b+4*10^i,i=0..d-1);

%p end proc:

%p seq(f(d),d=1..9);

%t Sort[FromDigits/@Flatten[Table[Permutations[PadRight[{5},n,1]],{n,9}],1]] (* _Harvey P. Dale_, Sep 03 2016 *)

%K nonn,base

%O 1,1

%A _Jaroslav Krizek_, Nov 13 2011

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)