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Search: id:A131801
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| A131801 |
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Increment each prime factor for each term of the least prime sequence A087443. |
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+0
3
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| 1, 3, 9, 15, 27, 45, 105, 81, 135, 225, 315, 1155, 243, 405, 675, 945, 1575, 3465, 15015, 729, 1215, 2025, 3375, 2835, 4725, 10395, 11025, 17325, 45045, 255255, 2187, 3645, 6075, 10125, 8505, 14175, 23625, 31185, 33075, 51975, 121275, 135135, 225225
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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T(n,k) = A003961[A087443(n,k)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 01 2007
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EXAMPLE
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The term 30 = 2*3*5
becomes 105 = 3*5*7
A087443 begins
1
2
4...6
8...12...30
16
etc
so a(n) begins
1
3
9...15
27..45..105
81
etc
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CROSSREFS
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Cf. A025487.
Cf. A131822.
Sequence in context: A082897 A147516 A131822 this_sequence A122819 A099409 A002127
Adjacent sequences: A131798 A131799 A131800 this_sequence A131802 A131803 A131804
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KEYWORD
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easy,tabf,nonn
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AUTHOR
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Alford Arnold (Alford1940(AT)aol.com), Jul 16 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 01 2007
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