login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A249116 Ordered union of the sets {h^6, h >=1} and {32*k^6, k >=1}. 3
1, 32, 64, 729, 2048, 4096, 15625, 23328, 46656, 117649, 131072, 262144, 500000, 531441, 1000000, 1492992, 1771561, 2985984, 3764768, 4826809, 7529536, 8388608, 11390625, 16777216, 17006112, 24137569, 32000000, 34012224, 47045881, 56689952, 64000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Let S = {h^6, h >=1} and T = {32*k^6, k >=1}.  Then S and T are disjoint.  The position of n^6 in the ordered union of S and T is A249117(n), and the position of 32*n^6 is A249118(n).  Equivalently, the latter two give the positions of n*2^(2/3) and n*2^(3/2), respectively, when all the numbers h*2^(2/3) and k*2^(3/2) are jointly ranked.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

EXAMPLE

{h^6, h >=1} = {1, 64, 729, 4096, 15625, 46656, 117649, ...};

{32*k^6, k >=1} = {32, 2048, 23328, 131072, 500000, ...};

so the union is {1, 32, 64, 729, 2048, 4096, 15625, ...}

MATHEMATICA

z = 200; s = Table[h^6, {h, 1, z}]; t = Table[32*k^6, {k, 1, z}];

v = Union[s, t]  (* A249116 *)

Flatten[Table[Flatten[Position[v, s[[n]]]], {n, 1, 100}]]  (* A249117 *)

Flatten[Table[Flatten[Position[v, t[[n]]]], {n, 1, 100}]]  (* A249118 *)

CROSSREFS

Cf. A249117, A249118.

Sequence in context: A076469 A256819 A235057 * A110562 A275187 A045048

Adjacent sequences:  A249113 A249114 A249115 * A249117 A249118 A249119

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Oct 21 2014

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 6 16:14 EDT 2020. Contains 333276 sequences. (Running on oeis4.)