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Search: id:A154727
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| A154727 |
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Triangle read by rows in which row n lists all the pairs of prime numbers that are equidistant from n, or only n if there is no such pair, as shown below in the example. |
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11
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| 1, 2, 3, 3, 5, 3, 7, 5, 7, 3, 11, 3, 5, 11, 13, 5, 7, 11, 13, 3, 7, 13, 17
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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Triangle begins:
. . . . . . . . . . . . . 1
. . . . . . . . . . . . . 2
. . . . . . . . . . . . . 3
. . . . . . . . . . . .3, .. 5
. . . . . . . . . . 3, .. .. .. 7
. . . . . . . . . . .. 5, .. 7, .. .
. . . . . . . 3, .. .. .. .. .. .. ..11
. . . . . .3, .. 5, .. .. .. .. . 11, ..13
. . . . .. .. 5, .. 7, .. .. . 11, . 13, .. .
. . .3, .. .. .. 7, .. .. .. .. . 13, .. .. ..17
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CROSSREFS
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Cf. A000040, A154720, A154721, A154722, A154723, A154724, A154725, A154726.
Sequence in context: A152984 A064921 A064917 this_sequence A065070 A070800 A138663
Adjacent sequences: A154724 A154725 A154726 this_sequence A154728 A154729 A154730
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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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