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Search: id:A138561
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| A138561 |
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Start with the list {1}; for each n >= 1, append p(n) primes followed by c(n) composite numbers, where p(n) is the n-th prime and c(n) is the n-th composite number. |
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1
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| 1, 2, 3, 4, 6, 8, 9, 5, 7, 11, 10, 12, 14, 15, 16, 18, 13, 17, 19, 23
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A rearrangement of the natural numbers.
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EXAMPLE
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We start with 1; p(1) = 2 is the first prime and the next two terms are 2,3 while c(1)=4 is the first composite number and the next four terms are 4,6,8,9 and so on.
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CROSSREFS
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Sequence in context: A082315 A082320 A067118 this_sequence A153276 A151988 A039255
Adjacent sequences: A138558 A138559 A138560 this_sequence A138562 A138563 A138564
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KEYWORD
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easy,nonn,more
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2008
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