Courtesy of Mathematica, here are primitive roots in Z/p for the first hundred primes p.  Other online sites might give you different roots, because these are not necessarily distinct.

p        Primitive Root in /p

Out[21]//TableForm=

2 1
3 2
5 2
7 3
11 2
13 2
17 3
19 2
23 5
29 2
31 3
37 2
41 6
43 3
47 5
53 2
59 2
61 2
67 2
71 7
73 5
79 3
83 2
89 3
97 5
101 2
103 5
107 2
109 6
113 3
127 3
131 2
137 3
139 2
149 2
151 6
157 5
163 2
167 5
173 2
179 2
181 2
191 19
193 5
197 2
199 3
211 2
223 3
227 2
229 6
233 3
239 7
241 7
251 6
257 3
263 5
269 2
271 6
277 5
281 3
283 3
293 2
307 5
311 17
313 10
317 2
331 3
337 10
347 2
349 2
353 3
359 7
367 6
373 2
379 2
383 5
389 2
397 5
401 3
409 21
419 2
421 2
431 7
433 5
439 15
443 2
449 3
457 13
461 2
463 3
467 2
479 13
487 3
491 2
499 7
503 5
509 2
521 3
523 2
541 2
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