login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A179440 The smallest magic constant of pan-diagonal magic squares which consist of distinct prime numbers 1
240, 395, 450, 733 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Classic pan-diagonal magic squares exist for orders n > 3 not of the form 4k+2.

Non-traditional pandiagonal magic squares exist for all orders n > 3.

Bounds for further terms: a(8) <= 1248, a(9) <= 2025, a(10) <= 2850, a(11) <= 4195, a(12) <= 5544, a(13) <= 7597.

LINKS

Table of n, a(n) for n=4..7.

N. Makarova, (in Russian)

V. Pavlovsky, (in Russian)

S. Belyaev , (in Russian)

Mutsumi Suzuki, MagicSquare

Al Zimmermann's Programming Contests, Pandiagonal Magic Squares of Prime Numbers: Final Report

EXAMPLE

a(5) = 395 (found by V. Pavlovsky)

    5  73 127 137  53

   37 167  17  71 103

   83 101  13  67 131

   43  31 197 113  11

  227  23  41   7  97

.

a(6) = 450 (found by Radko Nachev)

    3   5  89 137  67 149

  127 163   7  29  11 113

   31  23 167  59 157  13

  107  97  43  53 131  19

   73  79  41  71  47 139

  109  83 103 101  37  17

.

a(7) = 733 (found by Jarek Wroblewski)

    3   7 173 223  17 197 113

  181 211  11  79 131  23  97

   43  41 149  89 137 191  83

  233 103 107  73 127  31  59

   29 167 101  19 199  67 151

    5  47 139 179 109  61 193

  239 157  53  71  13 163  37

CROSSREFS

Cf. A073523

Sequence in context: A099833 A272950 A255266 * A154378 A300145 A063372

Adjacent sequences:  A179437 A179438 A179439 * A179441 A179442 A179443

KEYWORD

more,nonn,bref

AUTHOR

Natalia Makarova, Jul 14 2010

EXTENSIONS

Correction for the third term with example given Natalia Makarova, Jul 21 2010

Link and example corrected by Natalia Makarova, Aug 01 2010

Edited by Max Alekseyev, Mar 15 2011

Bound for a(9) improved by Alex Chernov, Apr 23 2011

Bound for a(12) improved by _Natalya Makarova_, Jun 21 2011

Corrected a(6) from Radko Nachev, added by Max Alekseyev, May 28 2013

a(7) from Jarek Wroblewski and new bounds from Al Zimmermann's contest, added by Max Alekseyev, Oct 11 2013

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 February 24 20:34 EST 2021. Contains 341584 sequences. (Running on oeis4.)