login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A241835 Numbers k such that k^2 is s-greedy summable, where s is the sequence A000290 of squares. 4
5, 7, 9, 11, 13, 15, 18, 19, 21, 23, 25, 27, 30, 32, 33, 35, 37, 39, 41, 43, 46, 48, 49, 51, 53, 55, 57, 59, 61, 63, 66, 68, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 90, 92, 93, 95, 98, 99, 101, 103, 105, 107, 109, 111, 113, 115, 118, 120, 121, 123, 126, 128 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

Greedy residue sums are introduced at A241833.

LINKS

Clark Kimberling, Table of n, a(n) for n = 2..1000

EXAMPLE

5^2 = 4^2 + 3^2; 7^2 = 6^2 + 3^2 + 3^2; 9^2 = 8^2 + 4^2 + 1^2.

MATHEMATICA

z = 200;  s = Table[n^2, {n, 1, z}]; t = Table[{s[[n]], #, Total[#] == s[[n]]} &[   DeleteCases[-Differences[FoldList[If[#1 - #2 >= 0, #1 - #2, #1] &, s[[n]], Reverse[Select[s, # < s[[n]] &]]]], 0]], {n, z}]; r[n_] := s[[n]] - Total[t[[n]][[2]]]; tr =  Table[r[n], {n, 2, z}]  (* A241833 *)

c = Table[Length[t[[n]][[2]]], {n, 2, z}] (* A241834 *)

f = 1 + Flatten[Position[tr, 0]]  (* A241835 *)

f^2  (* A241836 *) (* Peter J. C. Moses, May 06 2014 *)

CROSSREFS

Cf. A241832, A241835, A241836, A000290.

Sequence in context: A062545 A020735 A108144 * A279914 A123910 A024886

Adjacent sequences:  A241832 A241833 A241834 * A241836 A241837 A241838

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, May 09 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 June 25 04:06 EDT 2019. Contains 324345 sequences. (Running on oeis4.)