
COMMENTS

Classic pandiagonal magic squares exist for orders n>3 not of the form 4k+2.
Nontraditional 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.


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)


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
