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Search: id:A104887
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| A104887 |
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Triangle T(n,k) = (n-k+1)th prime, read by rows. |
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+0
1
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| 2, 3, 2, 5, 3, 2, 7, 5, 3, 2, 11, 7, 5, 3, 2, 13, 11, 7, 5, 3, 2, 17, 13, 11, 7, 5, 3, 2, 19, 17, 13, 11, 7, 5, 3, 2, 23, 19, 17, 13, 11, 7, 5, 3, 2, 29, 23, 19, 17, 13, 11, 7, 5, 3, 2, 31, 29, 23, 19, 17, 13, 11, 7, 5, 3, 2, 37, 31, 29, 23, 19, 17, 13, 11, 7, 5, 3, 2, 41, 37, 31, 29
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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Repeatedly writing the prime sequence backwards.
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FORMULA
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T(n,k) = A000040(n-k+1); a(n) = A000040(A004736(n)).
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EXAMPLE
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Triangle begins:
2
3,2
5,3,2
7,5,3,2
11,7,5,3,2
13,11,7,5,3,2
17,13,11,7,5,3,2
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CROSSREFS
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Reflected triangle of A037126.
Sequence in context: A112764 A108728 A049805 this_sequence A064886 A029600 A111076
Adjacent sequences: A104884 A104885 A104886 this_sequence A104888 A104889 A104890
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 29 2005
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EXTENSIONS
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Edited by Ralf Stephan, Apr 05 2009
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