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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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