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Search: id:A138143
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| A138143 |
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Triangle read by rows in which row n lists p(1), p(2), ..., p(n), p(n-1), ..., p(1), where p(i) = i-th prime. |
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3
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| 2, 2, 3, 2, 2, 3, 5, 3, 2, 2, 3, 5, 7, 5, 3, 2, 2, 3, 5, 7, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 17, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 17, 19, 17, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 17, 19, 23, 19, 17, 13, 11, 7, 5, 3, 2, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 23, 19, 17, 13, 11, 7, 5, 3, 2
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Row n contains 2n-1 terms and each column lists the prime numbers A000040.
Triangle of primes mentioned in A061802.
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EXAMPLE
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Triangle begins:
.............. 2
........... 2, 3, 2
........ 2, 3, 5, 3, 2
..... 2, 3, 5, 7, 5, 3, 2
.. 2, 3, 5, 7,11, 7, 5, 3, 2
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CROSSREFS
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Cf. A000040, A061802, A066622, A037126.
Sequence in context: A153095 A054483 A108939 this_sequence A106441 A131836 A133829
Adjacent sequences: A138140 A138141 A138142 this_sequence A138144 A138145 A138146
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KEYWORD
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easy,nonn,tabf
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Mar 09 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 07 2008, Nov 15 2008
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