A072252 Numbers n for which one step of the Collatz iteration (3n+1)/2^r gives rise to values 41,35,29,23,17,11, and 5 for r=1,3,5,..,13.

27, 93, 309, 981, 2901, 7509, 13653

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Formula

Appears to be (( 82-12*n)*4^n-1)/3. - Don Reble, Oct 31 2005

Crossrefs

Sequence in context: A101100 A226359 A078183 * A154041 A233156 A118615

Adjacent sequences: A072249 A072250 A072251 * A072253 A072254 A072255

Keyword

nonn,fini,full

Author

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

Extensions

Edited by T. D. Noe, Apr 10 2009

Status

approved