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Search: id:A145605
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| A145605 |
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Irregular triangle in which row n consists of all numbers x such that x and x+1 are both prime(n)-smooth numbers but not both prime(n-1)-smooth. |
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+0
4
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| 1, 2, 3, 8, 4, 5, 9, 15, 24, 80, 6, 7, 14, 20, 27, 35, 48, 49, 63, 125, 224, 2400, 4374, 10, 11, 21, 32, 44, 54, 55, 98, 99, 120, 175, 242, 384, 440, 539, 3024, 9800, 12, 13, 25, 26, 39, 64, 65, 77, 90, 104, 143, 168, 195, 324, 350, 351, 363, 624, 675, 728, 1000, 1715
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The length of row n is A145604(n). The largest x in row n is A145606(n). This is sequence A138180 with only the first occurrence of each number retained. Row n begins with prime(n)-1.
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LINKS
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T. D. Noe, Rows n=1..15 of triangle, flattened
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EXAMPLE
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1
2, 3, 8
4, 5, 9, 15, 24, 80
6, 7, 14, 20, 27, 35, 48, 49, 63, 125, 224, 2400, 4374
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CROSSREFS
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Sequence in context: A011162 A079555 A100870 this_sequence A111809 A100869 A110142
Adjacent sequences: A145602 A145603 A145604 this_sequence A145606 A145607 A145608
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KEYWORD
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nonn,tabf
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), Oct 14 2008, Nov 03 2008
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