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Search: id:A122507
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| A122507 |
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Triangular in which row n contains first n terms of A018805. |
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+0
1
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| 1, 1, 3, 1, 3, 7, 1, 3, 7, 11, 1, 3, 7, 11, 19, 1, 3, 7, 11, 19, 23, 1, 3, 7, 11, 19, 23, 35, 1, 3, 7, 11, 19, 23, 35, 43, 1, 3, 7, 11, 19, 23, 35, 43, 55, 1, 3, 7, 11, 19, 23, 35, 43, 55, 63, 1, 3, 7, 11, 19, 23, 35, 43, 55, 63, 83
(list; table; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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1
1, 3
1, 3, 7
1, 3, 7, 11
1, 3, 7, 11, 19
1, 3, 7, 11, 19, 23
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MATHEMATICA
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a1 = Table[ FoldList[ Plus, 1, 2 Array[ EulerPhi, n, 2 ] ], {n, 0, 10}] Flatten[a1]
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CROSSREFS
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Cf. A018805.
Sequence in context: A058659 A053642 A152903 this_sequence A094250 A114972 A107461
Adjacent sequences: A122504 A122505 A122506 this_sequence A122508 A122509 A122510
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KEYWORD
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nonn,tabl
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 15 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Jun 16 2007
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