The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A057903

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A057903

Positive integers that are not the sum of exactly two positive cubes.
(history; published version)

#11 by R. J. Mathar at Fri Jan 11 13:23:17 EST 2013

STATUS

editing

approved

#10 by R. J. Mathar at Fri Jan 11 13:23:09 EST 2013

LINKS

Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CubicNumber.html">Link to a section of The World of MathematicsCubic number.</a>

STATUS

approved

editing

#9 by Bruno Berselli at Thu Nov 08 09:06:42 EST 2012

STATUS

proposed

approved

#8 by Jean-François Alcover at Thu Nov 08 09:04:59 EST 2012

STATUS

editing

proposed

#7 by Jean-François Alcover at Thu Nov 08 09:04:53 EST 2012

MATHEMATICA

pr[n_] := Select[ PowersRepresentations[n, 2, 3], FreeQ[#, 0]& ]; Select[ Range[80], pr[#] == {} &] (* Jean-François Alcover, Nov 08 2012 *)

STATUS

approved

editing

#6 by Russ Cox at Sat Mar 31 12:38:54 EDT 2012

AUTHOR

Eric Weisstein (eric(AT)weisstein.com)

Eric W. Weisstein

Discussion

Sat Mar 31

12:38

OEIS Server: https://oeis.org/edit/global/877

#5 by Russ Cox at Fri Mar 30 16:48:54 EDT 2012

EXTENSIONS

Edited by _N. J. A. Sloane (njas(AT)research.att.com), _, Sep 28 2007

Discussion

Fri Mar 30

16:48

OEIS Server: https://oeis.org/edit/global/110

#4 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

EXTENSIONS

Edited by N. J. A. Sloane (njas, (AT)research.att.com), Sep 28 2007

#3 by N. J. A. Sloane at Sun Jun 29 03:00:00 EDT 2008

LINKS

E. W. Eric Weisstein, 's World of Mathematics, <a href="http://mathworld.wolfram.com/CubicNumber.html">Link to a section of The World of Mathematics.</a>

KEYWORD

nonn,new

nonn

AUTHOR

Eric W. Weisstein (eric(AT)weisstein.com)

#2 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007

COMMENTS

Includes the cubes themselves (since a^3 = b^3 + c^3 has no solution, by the exponent 3 case of Fermat's Last Theorem), so is different from A022555.

FORMULA

Equals A022555 union A000578 - {0}.

CROSSREFS

Cf. A022555, A000578.

KEYWORD

nonn,new

nonn

EXTENSIONS

Edited by njas, Sep 28 2007