cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A025386 Numbers that are the sum of 4 distinct nonzero squares in 2 or more ways.

Original entry on oeis.org

78, 90, 94, 95, 99, 102, 105, 110, 111, 114, 119, 123, 126, 129, 130, 134, 135, 138, 141, 142, 143, 146, 147, 150, 151, 153, 154, 155, 156, 158, 159, 162, 165, 166, 167, 169, 170, 171, 174, 175, 177, 179, 182, 183, 185, 186, 189, 190, 191, 193, 194, 195, 197, 198, 199
Offset: 1

Views

Author

David W. Wilson

Keywords

Links

Formula

{n: A025443(n) >= 2}. Union of A025387 and A025376. - R. J. Mathar, Jun 15 2018

A025378 Numbers that are the sum of 4 distinct nonzero squares in exactly 3 ways.

Original entry on oeis.org

78, 102, 110, 114, 130, 135, 147, 156, 159, 171, 175, 177, 189, 191, 194, 201, 204, 205, 211, 221, 228, 233, 235, 237, 247, 252, 265, 271, 277, 281, 284, 312, 316, 340, 341, 348, 349, 353, 367, 397, 404, 408, 433, 440, 456, 508, 520, 624, 652, 748, 776, 816, 892, 912
Offset: 1

Views

Author

David W. Wilson

Keywords

Links

Crossrefs

Cf. A025387.

Programs

  • Mathematica
    With[{upto=950},Select[Union[Transpose[Select[Tally[Total/@ Subsets[ Range[ Ceiling[ Sqrt[upto-14]]]^2,{4}]],Last[#]==3&]][[1]]], #<=upto&]] (* Harvey P. Dale, Sep 08 2011 *)

Formula

{n: A025443(n) = 3}. - R. J. Mathar, Jun 15 2018
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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