%I A072253
%S A072253 39,141,501,1749,5973,19797,62805,185685,480597,873813
%N A072253 Numbers n for which one step of the Collatz iteration (3n+1)/2^r gives 
               rise to values 59,53,47,41,35,29,23,17,11 and 5 for r=1,3,5,..,19.
%F A072253 Appears to be ((118-12*n)*4^n-1)/3. - Don Reble (djr(AT)nk.ca), Oct 31 
               2005
%Y A072253 Sequence in context: A118634 A044371 A044752 this_sequence A128826 A158593 
               A158598
%Y A072253 Adjacent sequences: A072250 A072251 A072252 this_sequence A072254 A072255 
               A072256
%K A072253 nonn,fini,full
%O A072253 1,1
%A A072253 N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002
%E A072253 Extended and edited by T. D. Noe (noe(AT)sspectra.com), Apr 10 2009