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A093545 Sorted mapping of A093544 onto the integers. 4

%I #68 Mar 24 2021 03:06:50

%S 0,2,1,5,7,3,10,12,4,15,17,6,20,22,8,25,27,9,30,32,11,35,37,13,40,42,

%T 14,45,47,16,50,52,18,55,57,19,60,62,21,65,67,23,70,72,24,75,77,26,80,

%U 82,28,85,87,29,90,92,31,95,97,33,100,102,34,105,107,36,110,112,38

%N Sorted mapping of A093544 onto the integers.

%C As A093544 contains the odd numbers not of form 12k+9, we map from modulo 12 to modulo 5: 1->0, 3->1, 5->2, 7->3, 11->4.

%H Michael De Vlieger, <a href="/A093545/b093545.txt">Table of n, a(n) for n = 0..10000</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the nonnegative integers</a>

%H <a href="/index/Rec#order_12">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,1,0,0,0,0,0,1,0,0,-1).

%F a(3n) = 5n, a(3n+1) = 5n+2, a(3n+2) = A047206(n).

%F G.f.: x*(x^10 + 3*x^9 + 5*x^8 + x^7 + 5*x^6 + 5*x^5 + 2*x^4 + 5*x^3 + 5*x^2 + x + 2)/(1 - x^3 - x^9 + x^12).

%t CoefficientList[Series[x (x^10 + 3 x^9 + 5 x^8 + x^7 + 5 x^6 + 5 x^5 + 2 x^4 + 5 x^3 + 5 x^2 + x + 2)/(1 - x^3 - x^9 + x^12), {x, 0, 68}], x] (* _Michael De Vlieger_, Mar 05 2021 *)

%o (PARI) a(n)=5*(A093544(n)\12)+if(A093544(n)%12==11,4,((A093544(n)%12)-1)/2)

%Y Cf. A047206, A340615 (inverse permutation), A014682.

%K nonn

%O 0,2

%A _Ralf Stephan_, Mar 31 2004

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Last modified May 10 17:01 EDT 2024. Contains 372388 sequences. (Running on oeis4.)