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A230634 Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly two solutions. 11

%I #12 May 25 2016 18:48:38

%S 17,19,21,34,36,38,51,53,55,65,67,70,72,82,84,86,99,101,103,116,118,

%T 120,130,132,135,137,147,149,151,164,166,168,181,183,185,195,197,200,

%U 202,212,214,216,229,231,233,246,248,250,257,261,262,263,267,274,276,278,291,293,295,308,310,312,322,324,327,329,339

%N Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly two solutions.

%H Donovan Johnson, <a href="/A230634/b230634.txt">Table of n, a(n) for n = 1..10000</a>

%H <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a>

%t etsQ[n_]:=Count[#+Total[IntegerDigits[#,4]]&/@Range[n-1],n]==2; Select[ Range[ 350],etsQ] (* _Harvey P. Dale_, May 25 2016 *)

%Y Related base-4 sequences: A053737, A230631, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1)

%K nonn,base

%O 1,1

%A _N. J. A. Sloane_, Oct 30 2013

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Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)