|
Search: id:A072262
|
|
|
| A072262 |
|
a(n)=4*a(n-1)+1, a(1)=11. |
|
+0
2
|
|
| 11, 45, 181, 725, 2901, 11605, 46421, 185685, 742741, 2970965, 11883861, 47535445, 190141781, 760567125, 3042268501, 12169074005, 48676296021, 194705184085, 778820736341, 3115282945365, 12461131781461, 49844527125845
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
These are the integers N which on application of the Collatz function yield the number 17. The Collatz function: if N is an odd number then (3N+1)/2^r yields a positive odd integer for some value of r (which in this case is 17).
|
|
MATHEMATICA
|
a[n_] := 4a[n - 1] + 1; a[1] = 11; Table[ a[n], {n, 1, 25}]
|
|
CROSSREFS
|
Cf. A072257, A072258, A072259, A072260 & A072261.
Sequence in context: A057813 A051740 A144932 this_sequence A110114 A116193 A063158
Adjacent sequences: A072259 A072260 A072261 this_sequence A072263 A072264 A072265
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. Rathankar (rathankar(AT)yahoo.com), Jul 08 2002
|
|
EXTENSIONS
|
Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 17 2002
|
|
|
Search completed in 0.002 seconds
|
