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A165288
Possible values of the difference between a cube and the largest square not larger than the cube.
7
0, 2, 4, 7, 11, 13, 19, 20, 26, 28, 35, 39, 40, 45, 47, 48, 49, 53, 55, 56, 60, 63, 67, 74, 76, 79, 81, 83, 100, 104, 107, 109, 116, 135, 139, 146, 147, 148, 150, 152, 155, 170, 174, 180, 184, 186, 191, 193, 200, 207, 212, 215, 216, 233, 235, 242, 244, 251, 270, 277
OFFSET
1,2
COMMENTS
The values of A077116, sorted and duplicates removed.
Note that the values have been generated with a finite search radius and are not proved to be complete. [R. J. Mathar, Oct 09 2009]
Except for the leading 0, a subsequence of A229618 which is in turn (except for the initial 1) a subsequence of A106265. The values {15, 18, 25, 44, 54, 61, 71, 72, 87, 106, 112, 118, 126, 127,...} are in A229618 but not in the present sequence. Using results from A179386, it should be possible to prove that the sequence is complete up to a given point. - M. F. Hasler, Sep 26 2013
EXAMPLE
The gap 0 appears in 1^3-1^2 or 4^3-8^2 etc.
The gap 2 appears for example in 3^3-5^2.
The gap 4 appears for example in 2^3-2^2 or 5^3-11^2.
The gap 19 appears in 7^3-18^2, the gap 20 in 6^3-14^2.
MATHEMATICA
lst={}; Do[a=n^3-Floor[Sqrt[n^3]]^2; If[a<=508, AppendTo[lst, a]], {n, 2*8!}]; Take[Union@lst, 90]
CROSSREFS
Essentially the same as A087285.
Sequence in context: A356133 A191323 A307207 * A327572 A370905 A362946
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited by R. J. Mathar, Oct 09 2009
Name corrected by M. F. Hasler, Oct 05 2013
STATUS
approved