A253897 - OEIS

%I #6 Jan 25 2015 21:48:40

%S 3,4,5,6,8,9,10,12,14,15,16,18,20,21,22,24,28,30,33,35,36,39,40,44,45,

%T 48,50,55,56,60,63,66,70,72,75,77,78,80,84,88,90,91,99,102,104,105,

%U 108,112,117,120,126,130,132,135,140,144,150,154,160,165,168,176,180,182,195,198,208

%N Numbers n such that the sequence A127644 with a(1) = n is conjectured to give a permutation of the natural numbers.

%C See A127644 for more information.

%e a(1) = 3 because A127644 is conjectured to be a permutation of the natural numbers.

%o (PARI) b(r)=v=[r];n=1;while(n<100,p=prod(i=1,#v,v[i]);if(p*n\(vecsum(v)+n)==p*n/(vecsum(v)+n)&&!vecsearch(vecsort(v),n),v=concat(v,n);n=0);n++);#v

%o r=1;while(r<500,if(b(r)>50,print1(r,", "));r++)

%Y Cf. A127644, A252984.

%K nonn

%O 1,1

%A _Derek Orr_, Jan 17 2015