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1, 2, 8, 12, 40, 24, 108, 88, 168, 128, 420, 184, 696, 384, 576, 640, 1536, 612, 2160, 1024, 1680, 1500, 3784, 1440, 4000, 2544, 4140, 2904, 7560, 2224, 9240, 5184, 6880, 5760, 9216, 4752, 15552, 8100, 11376, 7840, 21200, 6504, 24528, 12080, 15072, 14300
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..2500
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FORMULA
| a(n) = A000010(n) * A002088(n). Equals row sums of triangle A143230.
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EXAMPLE
| a(5) = 40 = A000010(5) * A002088(5) = 4 * 10.
a(5) = 40 = sum of row 5 terms of triangle A143230: (4 + 4 + 8 + 8 + 16).
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MAPLE
| with(numtheory): a := proc(n) return phi(n)*add(phi(k), k=1..n): end: seq(a(n), n=1..46); # Nathaniel Johnston, Jun 26 2011
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CROSSREFS
| Cf. A000010, A002088, A143230.
Sequence in context: A176961 A078541 A135443 * A104039 A083546 A013190
Adjacent sequences: A143228 A143229 A143230 * A143232 A143233 A143234
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KEYWORD
| nonn
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 31 2008
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EXTENSIONS
| Terms after a(14) from Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), Jun 26 2011
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