Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
editing
approved
12 is a member because 12 = (3*2^3)/(1*2^1) = (9*2^9)/(6*2^6). Entries which are generated in two or more different ways are 1,12,20,32,48,72,80,112,160,192,256,576,768,..., . - _Robert G. Wilson v _, May 10 2006.
lst = {1}; Do[ If[ (Log[10, a] + a*Log[10, 2]) - (Log[10, b] + b*Log[10, 2]) < 3 && IntegerQ[(a*2^a)/(b*2^b)], AppendTo[lst, (a*2^a)/(b*2^b)]; Print[(a*2^a)/(b*2^b)]], {a, 4620}, {b, Max[1, a - 9(* =Log[2, 10^3] *)], a-1}]; lst (from _* _Robert G. Wilson v_, May 10 2006 *)
approved
editing
lst = {1}; Do[ If[ (Log[10, a] + a*Log[10, 2]) - (Log[10, b] + b*Log[10, 2]) < 3 && IntegerQ[(a*2^a)/(b*2^b)], AppendTo[lst, (a*2^a)/(b*2^b)]; Print[(a*2^a)/(b*2^b)]], {a, 4620}, {b, Max[1, a - 9(* =Log[2, 10^3] *)], a-1}]; lst (from _Robert G. Wilson v (rgwv(at)rgwv.com), _, May 10 2006)
More terms from _David W. Wilson (davidwwilson(AT)comcast.net)_
nonn,new
nonn
More terms from David W. Wilson <(davidwwilson(AT)comcast.net>)
nonn,new
nonn
More terms from David W. Wilson <davidwwilson(AT)comcast.net>
12 is a member because 12 = (3*2^3)/(1*2^1) = (9*2^9)/(6*2^6). Entries which are generated in two or more different ways are 1,12,20,32,48,72,80,112,160,192,256,576,768,..., . - RGWv Robert G. Wilson v May 10 2006.
lst = {1}; Do[ If[ (Log[10, a] + a*Log[10, 2]) - (Log[10, b] + b*Log[10, 2]) < 3 && IntegerQ[(a*2^a)/(b*2^b)], AppendTo[lst, (a*2^a)/(b*2^b)]; Print[(a*2^a)/(b*2^b)]], {a, 4620}, {b, Max[1, a - 9(* =Log[2, 10^3] *)], a-1}]; lst (from RGWv Robert G. Wilson v (rgwv(at)rgwv.com), May 10 2006)
nonn,new
nonn
12 is a member because 12 = (3*2^3)/(1*2^1) = (9*2^9)/(6*2^6). Entries which are generated in two or more different ways are 1,12,20,32,48,72,80,112,160,192,256,576,768,..., . - RGWv May 10 2006.
lst = {1}; Do[ If[ (Log[10, a] + a*Log[10, 2]) - (Log[10, b] + b*Log[10, 2]) < 3 && IntegerQ[(a*2^a)/(b*2^b)], AppendTo[lst, (a*2^a)/(b*2^b)]; Print[(a*2^a)/(b*2^b)]], {a, 4620}, {b, Max[1, a - 9(* =Log[2, 10^3] *)], a-1}]; lst (from RGWv (rgwv(at)rgwv.com), May 10 2006)
nonn,new
nonn
Positive integers that can be expressed in the form (a*2^a)/(b*2^b) where a and b are positive integers.
1, 3, 4, 5, 6, 8, 9, 10, 11, 12, 14, 16, 17, 18, 20, 24, 32, 33, 34, 36, 37, 40, 42, 48, 52, 64, 65, 66, 67, 68, 70, 72, 76, 80, 88, 96, 112, 128, 129, 130, 132, 135, 136, 142, 144, 156, 160, 184, 192, 240, 256, 257, 258, 260, 264, 272, 288, 320, 352, 384, 448, 512, 513
1,2
Odd values > 1 are of the form 2^n + odd divisor of n.
6 is included because 6 = (6*2^6)/(4*2^4)
nonn
Sam Handler (sam_5_5_5_0(AT)yahoo.com), Oct 09 2005
More terms from David Wilson <davidwwilson(AT)comcast.net>
approved