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Search: id:A154720
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| A154720 |
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Triangle read by rows in which row n lists 2n-1 terms: n, in the center of the row and all the pairs of non-composite numbers equidistant to n, with 0's inserted, as shown below in the example. |
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+0
18
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| 1, 1, 2, 3, 1, 0, 3, 0, 5, 1, 0, 3, 4, 5, 0, 7, 0, 0, 3, 0, 5, 0, 7, 0, 0, 1, 0, 0, 0, 5, 6, 7, 0, 0, 0, 11, 1, 0, 3, 0, 0, 0, 7, 0, 0, 0, 11, 0, 13, 0, 0, 3, 0, 5, 0, 0, 8, 0, 0, 11, 0, 13, 0, 0, 1, 0, 0, 0, 5, 0, 7, 0, 9, 0, 11, 0, 13, 0, 0, 0, 17
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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Triangle begins:
. . . . . . . . . . . . . . .1
. . . . . . . . . . . . . 1, 2, 3
. . . . . . . . . . . .1, 0, 3, 0, 5
. . . . . . . . . . 1, 0, 3, 4, 5, 0, 7
. . . . . . . . .0, 0, 3, 0, 5, 0, 7, 0, 0
. . . . . . . 1, 0, 0, 0, 5, 6, 7, 0, 0, 0,11
. . . . . .1, 0, 3, 0, 0, 0, 7, 0, 0, 0,11, 0,13
. . . . 0, 0, 3, 0, 5, 0, 0, 8, 0, 0,11, 0,13, 0, 0
. . .1, 0, 0, 0, 5, 0, 7, 0, 9, 0,11, 0,13, 0, 0, 0,17
. 1, 0, 3, 0, 0, 0, 7, 0, 0,10, 0, 0,13, 0, 0, 0,17, 0,19
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CROSSREFS
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Cf. A000040, A008578, A154721, A154722, A154723, A154724, A154725, A154726, A154727.
Sequence in context: A133623 A065862 A020921 this_sequence A071501 A004572 A082839
Adjacent sequences: A154717 A154718 A154719 this_sequence A154721 A154722 A154723
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jan 14 2009
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