A concentric magic square is nice. A concentric magic square with diamond is even better; see i.e. the 15x15 Al Antaakii concentric magic square with diamond. In the diamond are alle odd numbers (and outside the diamond are the even numbers).
How to construct a concentric magic square with diamond? Puzzle in EXCEL and see the result below:
23x23 concentric magic square with diamond
168 |
356 |
354 |
178 |
350 |
182 |
346 |
186 |
342 |
190 |
336 |
1 |
196 |
330 |
202 |
326 |
206 |
322 |
320 |
318 |
314 |
214 |
358 |
218 |
102 |
106 |
422 |
110 |
418 |
114 |
414 |
118 |
410 |
5 |
407 |
523 |
122 |
406 |
126 |
402 |
130 |
132 |
396 |
276 |
426 |
312 |
222 |
394 |
54 |
58 |
470 |
62 |
466 |
66 |
462 |
13 |
515 |
17 |
511 |
21 |
70 |
458 |
74 |
454 |
452 |
338 |
474 |
136 |
308 |
304 |
138 |
450 |
22 |
26 |
502 |
30 |
498 |
33 |
495 |
37 |
491 |
41 |
487 |
45 |
34 |
494 |
492 |
272 |
506 |
80 |
392 |
226 |
228 |
390 |
448 |
490 |
6 |
16 |
512 |
61 |
467 |
65 |
463 |
69 |
459 |
73 |
455 |
77 |
510 |
220 |
522 |
40 |
82 |
140 |
302 |
300 |
142 |
446 |
42 |
520 |
2 |
143 |
139 |
135 |
131 |
127 |
117 |
415 |
419 |
423 |
427 |
441 |
526 |
10 |
488 |
84 |
388 |
230 |
232 |
386 |
86 |
486 |
12 |
449 |
363 |
349 |
353 |
357 |
361 |
365 |
157 |
153 |
149 |
145 |
163 |
81 |
518 |
44 |
444 |
144 |
298 |
296 |
146 |
442 |
46 |
451 |
101 |
147 |
203 |
345 |
341 |
337 |
201 |
205 |
209 |
213 |
331 |
383 |
429 |
79 |
484 |
88 |
384 |
234 |
236 |
380 |
90 |
483 |
433 |
425 |
151 |
215 |
227 |
217 |
221 |
301 |
297 |
293 |
299 |
315 |
379 |
105 |
97 |
47 |
440 |
150 |
294 |
292 |
152 |
23 |
481 |
83 |
421 |
155 |
211 |
311 |
283 |
275 |
245 |
243 |
279 |
219 |
319 |
375 |
109 |
447 |
49 |
507 |
378 |
238 |
240 |
9 |
505 |
51 |
445 |
417 |
159 |
207 |
307 |
253 |
259 |
273 |
263 |
277 |
223 |
323 |
371 |
113 |
85 |
479 |
25 |
521 |
290 |
527 |
411 |
27 |
477 |
87 |
409 |
161 |
333 |
305 |
249 |
269 |
265 |
261 |
281 |
225 |
197 |
369 |
121 |
443 |
53 |
503 |
119 |
3 |
288 |
519 |
501 |
55 |
431 |
405 |
359 |
335 |
235 |
289 |
267 |
257 |
271 |
241 |
295 |
195 |
171 |
125 |
99 |
475 |
29 |
11 |
242 |
286 |
376 |
31 |
473 |
91 |
401 |
355 |
339 |
239 |
251 |
255 |
285 |
287 |
247 |
291 |
191 |
175 |
129 |
439 |
57 |
499 |
154 |
244 |
246 |
156 |
438 |
59 |
437 |
133 |
351 |
343 |
231 |
313 |
309 |
229 |
233 |
237 |
303 |
187 |
179 |
397 |
93 |
471 |
92 |
374 |
284 |
248 |
372 |
94 |
482 |
95 |
137 |
347 |
199 |
185 |
189 |
193 |
329 |
325 |
321 |
317 |
327 |
183 |
393 |
435 |
48 |
436 |
158 |
282 |
280 |
160 |
434 |
50 |
516 |
141 |
367 |
181 |
177 |
173 |
169 |
165 |
373 |
377 |
381 |
385 |
167 |
389 |
14 |
480 |
96 |
370 |
250 |
252 |
368 |
98 |
478 |
360 |
4 |
387 |
391 |
395 |
399 |
403 |
413 |
115 |
111 |
107 |
103 |
89 |
528 |
170 |
52 |
432 |
162 |
278 |
274 |
164 |
430 |
306 |
8 |
514 |
18 |
469 |
63 |
465 |
67 |
461 |
71 |
457 |
75 |
453 |
20 |
310 |
524 |
224 |
100 |
366 |
256 |
260 |
364 |
382 |
24 |
504 |
28 |
500 |
32 |
497 |
35 |
493 |
39 |
489 |
43 |
485 |
496 |
36 |
38 |
258 |
508 |
148 |
166 |
270 |
262 |
332 |
56 |
472 |
60 |
468 |
64 |
464 |
68 |
517 |
15 |
513 |
19 |
509 |
460 |
72 |
456 |
76 |
78 |
192 |
476 |
198 |
268 |
264 |
104 |
424 |
108 |
420 |
112 |
416 |
116 |
412 |
120 |
525 |
123 |
7 |
408 |
124 |
404 |
128 |
400 |
398 |
134 |
254 |
428 |
266 |
172 |
174 |
176 |
352 |
180 |
348 |
184 |
344 |
188 |
340 |
194 |
529 |
334 |
200 |
328 |
204 |
324 |
208 |
210 |
212 |
216 |
316 |
362 |
Puzzle yourself using the EXCEL download below.