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A067837
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a(1)=2; to form a(n+1), append P, the largest prime < a(n), if any and Q, the smallest prime > a(n), at the beginning and the end of a(n), respectively.
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0
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OFFSET
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1,1
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LINKS
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EXAMPLE
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To form a(2), note that there is no prime before 2 and that 3 is the prime coming immediately after 2. So a(2) = 23. To form a(3), the prime coming immediately before 23 is 19 and the prime coming immediate after 23 is 29. So a(3) = 192329.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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