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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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OFFSET
| 1,1
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EXAMPLE
| 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
| Sequence in context: A090511 A114256 A110714 * A089987 A162605 A118812
Adjacent sequences: A067834 A067835 A067836 * A067838 A067839 A067840
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KEYWORD
| base,nonn
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AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 11 2002
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