在数列{a n}中，a n ＋1＝ca n(c为非零常数)，前n项和为S n＝3 n＋k，则实数k的值为(  )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24232' and id < 2095969 and id<>'2095969' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='24232' and id > 2095969 and id<>'2095969' order by id asc limit 5