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A079588
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(n+1)(2n+1)(4n+1).
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2
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1, 30, 135, 364, 765, 1386, 2275, 3480, 5049, 7030, 9471, 12420, 15925, 20034, 24795, 30256, 36465, 43470, 51319, 60060, 69741, 80410, 92115, 104904, 118825, 133926, 150255, 167860, 186789, 207090, 228811, 252000, 276705, 302974, 330855, 360396, 391645
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| R. Tijdeman, Some applications of Diophantine approximation, pp. 261-284 of Surveys in Number Theory (Urbana, May 21, 2000), ed. M. A. Bennett et al., Peters, 2003.
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FORMULA
| Sum 1/a(n) = Pi/3 (cf. Tijdeman).
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CROSSREFS
| Sequence in context: A044362 A044743 A100147 * A117750 A158462 A064495
Adjacent sequences: A079585 A079586 A079587 * A079589 A079590 A079591
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 26 2003
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