Revision History for A130280
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing entries 1-10
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#15 by N. J. A. Sloane at Thu May 23 08:30:10 EDT 2019
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#14 by N. J. A. Sloane at Thu May 23 08:30:08 EDT 2019
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| CROSSREFS
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See also A306767.
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| STATUS
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approved
editing
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#13 by Bruno Berselli at Fri May 12 05:42:10 EDT 2017
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#12 by Jean-François Alcover at Fri May 12 05:16:17 EDT 2017
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#11 by Jean-François Alcover at Fri May 12 05:15:27 EDT 2017
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| MATHEMATICA
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Table[an = a[n]; Print["a(", n, ") = ", an]; an, {n, 1, 800}]}] (* _Jean-François Alcover_, May 12 2017 *)
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Discussion
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| Fri May 12
| 05:16
| Jean-François Alcover: Updated Mma code checked against 800 terms of b-file.
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#10 by Jean-François Alcover at Fri May 12 05:14:15 EDT 2017
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| MATHEMATICA
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$MaxExtraPrecision = 100;
r[n_, c_] := Reduce[k> > 1 && j> > 1 && n*(k^2- - 1)+) + 1 == j^2, {j, k}, Integers] /. If[n <= 3, C[1] -> 2, C[1] -> 1] // c // Simplify;
a[n_] := If[rn = r[n, 0] || r[n, 1] || r[n] === , 2]; rn === False, 0, k /. {ToRules[r[n]]} // rn]} // Min];
Table[an = a[n]; Print["a(", n, ") = ", an]; an, {n, 1, 200}] (* _Jean-François Alcover_, May 12 2017 *)800}]
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approved
editing
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#9 by Bruno Berselli at Fri May 12 03:12:38 EDT 2017
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#8 by Jean-François Alcover at Fri May 12 02:39:44 EDT 2017
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#7 by Jean-François Alcover at Fri May 12 02:39:25 EDT 2017
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| MATHEMATICA
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r[n_] := Reduce[k > >1 && j > >1 && n*(k^2 - -1) + )+1 == j^2, {j, k}, }, Integers] /. If[n <= 3, C[1] -> 2, C[1] -> 1] // Simplify;
Integers] /. If[n <= 3, C[1] -> 2, C[1] -> 1] // Simplify;
Table[an = a[n]; Print["a(", n, ") = ", an]; an, {n, 1, 200}]}] (* _Jean-François Alcover_, May 12 2017 *)
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#6 by Jean-François Alcover at Fri May 12 02:37:14 EDT 2017
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| MATHEMATICA
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r[n_] := Reduce[k > 1 && j > 1 && n*(k^2 - 1) + 1 == j^2, {j, k},
Integers] /. If[n <= 3, C[1] -> 2, C[1] -> 1] // Simplify;
a[n_] := If[r[n] === False, 0, k /. {ToRules[r[n]]} // Min];
Table[an = a[n]; Print["a(", n, ") = ", an]; an, {n, 1, 200}]
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approved
editing
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