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Prime number

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Manager
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Prime number [#permalink] New post 03 Jan 2007, 22:32
Weird
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 [#permalink] New post 04 Jan 2007, 04:49
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Other then 256 all other numbers are prime ( product of number itself and 1, but 1 is not prime)
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 [#permalink] New post 04 Jan 2007, 06:38
Exactly thats what I got
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 [#permalink] New post 06 Jan 2007, 11:07
By the way, 1 is also a factor of 256. With all respect, I think the problem is not properly worded. It should ask for the largest number in the group that is not prime, not necessarily under 500 (for example, 17 * 17 = 289 is under 500 as well but doesn´t appear in the answer choices).
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Re: Prime number [#permalink] New post 07 Jan 2007, 17:57
jainan24 wrote:
Weird


though it is also a product of 1 and itself, 499 is also a prime.

list of primes between 1 and 1000:

2
3
5
7
11
13
17
19
23
29
31
37
41
43
47
53
59
61
67
71
73
79
83
89
97
101
103
107
109
113
127
131
137
139
149
151
157
163
167
173
179
181
191
193
197
199
211
223
227
229
233
239
241
251
257
263
269
271
277
281
283
293
307
311
313
317
331
337
347
349
353
359
367
373
379
383
389
397
401
409
419
421
431
433
439
443
449
457
461
463
467
479
487
491
499
503
509
521
523
541
547
557
563
569
571
577
587
593
599
601
607
613
617
619
631
641
643
647
653
659
661
673
677
683
691
701
709
719
727
733
739
743
751
757
761
769
773
787
797
809
811
821
823
827
829
839
853
857
859
863
877
881
883
887
907
911
919
929
937
941
947
953
967
971
977
983
991
997
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 [#permalink] New post 10 Jan 2007, 08:03
A

Are you sure, that we need a prime number? we need only a product of primes.
  [#permalink] 10 Jan 2007, 08:03
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Prime number

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