
#20
Apr1207, 10:20 PM

P: 998

An arithmetic sequence is one of the form [itex](n,n+k,n+2k,n+3k,...,n+mk,...)[/itex].




#21
Apr1307, 12:53 PM

P: 363

To me it makes sense to start with 199 and find "minimum" primesequence of 10 terms with spacing 210 : [tex] 199, 409, 619, 829, 1039, 1249, 1459, 1669, 1879, 2089 [/tex]. But it took me longer time ,about 10 seconds 



#22
Apr1307, 01:02 PM

P: 685





#23
Apr1307, 11:49 PM

P: 27

what about 31,41,51,61,71,81,91 ?
are there any nonprimes in there? but even if that is right (i doubt it is, i'm too tired to see the factors i probably should) i cheated b/c i guessed 



#24
Apr1307, 11:58 PM

P: 1,076





#25
Apr1407, 12:01 AM

P: 27

oh
haha 9*9 = 81 yep im tired Any idea where i could get a description of the concepts they are talking about? (I don't want to hijack the thread) 



#26
Apr1407, 12:24 AM

P: 998




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