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Next in sequence

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juliefer | 10:14 Thu 29th Jul 2010 | Quizzes & Puzzles
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What comes next in the sequence 6 9 15 21 33 39 51?

Thanks.
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57 = 3 x sequence of primes 2,3,5,7,11,13,17 (next being 19)
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Thanks so much, bibblebub. I've been puzzling over this one for weeks and I'd never have got it.
my pleasure

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