A371221 - OEIS

%I #6 Mar 16 2024 15:20:34

%S 1,3,2,5,7,9,11,13,15,4,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,

%T 47,49,51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,8,81,83,85,87,89,

%U 91,93,95,6,97,10,99,101,103,105,107,109,111,113,115,117,12

%N Inverse permutation to A371220.

%H Rémy Sigrist, <a href="/A371221/a371221.gp.txt">PARI program</a>

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

%F a(n) <= 2*n.

%e A371220(42) = 231, so a(231) = 42.

%o (PARI) See Links section.

%Y Cf. A371220.

%K nonn

%O 1,2

%A _Rémy Sigrist_, Mar 15 2024