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Search: id:A067837
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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
1
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| 2, 23, 192329, 192323192329192341, 192323192329192339192323192329192341192323192329192399
(list; graph; listen)
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OFFSET
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1,1
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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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Sequence in context: A090511 A114256 A110714 this_sequence A089987 A162605 A118812
Adjacent sequences: A067834 A067835 A067836 this_sequence A067838 A067839 A067840
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KEYWORD
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base,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 11 2002
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