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Prime Numbers Up to 300

Can you name all the prime numbers between 1 and 300?
Quiz by HinesBrothers
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Last updated: May 26, 2020
First submittedOctober 19, 2018
Times taken259
Average score85.5%
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Number
2
3
5
7
11
13
17
19
23
Number
29
31
37
41
43
47
53
59
61
Number
67
71
73
79
83
89
97
101
103
Number
107
109
113
127
131
137
139
149
151
Number
157
163
167
173
179
181
191
193
197
Number
199
211
223
227
229
233
239
241
251
Number
257
263
269
271
277
281
283
293
+2
Level 61
Oct 25, 2018
Awesome quiz! =)
+1
Level 67
Jul 11, 2019
Nice! 61/62
+1
Level 43
Aug 1, 2020
62 out of 62

1 min and 35 seconds left

AWESOME. LOL

+1
Level 59
Jul 12, 2022
Kind of easy, I suppose. It's just typing a lot of numbers ending in 1, 3, 7 and 9 and seeing what sticks.
+1
Level 32
Nov 10, 2022
Enter 21 and realize the digits sum to 3. This can not be prime. Rather than deleting the last digit, enter another 1.

211 is prime. This also works with 27 since 2+7 sums to a multiple of 3. 277 and 271 are prime.

Other first two digits follow a pattern. 127 151 157 181 211 241 271 are prime.

If three digits sum to a multiple of 3 the number is not prime. 111 117 171 177 207. Divide these numbers by three as a proof.

Of course some memorize. Let me know how You memorize prime numbers, please.