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Search: id:A154723
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| A154723 |
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Triangle read by rows in which row n lists all the pairs of non-composite numbers that are equidistant from n, or only n if there are no such pairs, as shown below in the example. |
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13
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| 1, 1, 3, 1, 5, 1, 3, 5, 7, 3, 7, 1, 5, 7, 11, 1, 3, 11, 13, 3, 5, 11, 13, 1, 5, 7, 11, 13, 17, 1, 3, 7, 13, 17, 19
(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, .. 3
. . . . . . . . . . . .1, .. .. .. 5
. . . . . . . . . . 1, .. 3, .. 5, .. 7
. . . . . . . . . . .. 3, .. .. .. 7, .. .
. . . . . . . 1, .. .. .. 5, .. 7, .. .. .,11
. . . . . .1, .. 3, .. .. .. .. .. .. ..11, ..13
. . . . .. .. 3, .. 5, .. .. .. .. ..11, ..13, .. .
. . .1, .. .. .. 5, .. 7, .. .. ..11, ..13, .. .. ..17
. 1, .. 3, .. .. .. 7, .. .. .. .. ..13, .. .. ..17, ..19
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CROSSREFS
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Cf. A000040, A008578, A154720, A154721, A154722, A154724, A154725, A154726, A154727.
Adjacent sequences: A154720 A154721 A154722 this_sequence A154724 A154725 A154726
Sequence in context: A016475 A037227 A056753 this_sequence A114567 A001051 A046730
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KEYWORD
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easy,more,nonn,tabf
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jan 14 2009, Jan 16 2009
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