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.

39, 141, 501, 1749, 5973, 19797, 62805, 185685, 480597, 873813

Offset

1,1

Links

Table of n, a(n) for n=1..10.

Formula

Appears to be ((118-12*n)*4^n-1)/3. - Don Reble, Oct 31 2005

Crossrefs

Sequence in context: A118634 A044371 A044752 * A128826 A240902 A158593

Adjacent sequences: A072250 A072251 A072252 * A072254 A072255 A072256

Keyword

nonn,fini,full

Author

N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002

Extensions

Extended and edited by T. D. Noe, Apr 10 2009

Status

approved