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Search: id:A097909
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| A097909 |
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Decimal expansion of sum_{i >= 1} f(i)/g(i), where f(i) = triangular number(i) and g(i) = (sum of first i primes)^4. |
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+0
1
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| 0, 6, 8, 0, 5, 5, 9, 4, 0, 8, 1, 5, 2, 5, 7, 5, 6, 9, 3, 2, 6, 3, 1, 3, 6, 5, 1, 5, 1, 0, 0, 5
(list; cons; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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0.0680559408152575...
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MATHEMATICA
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p = s = 0; Do[p += Prime[n]; k = n*(n+1)/2; s += k/p^4; Print[N[s, 50]], {n, 10^6}] - Ryan Propper (rpropper(AT)stanford.edu), Jul 22 2006
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CROSSREFS
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Sequence in context: A042497 A011315 A021151 this_sequence A143819 A021599 A072553
Adjacent sequences: A097906 A097907 A097908 this_sequence A097910 A097911 A097912
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KEYWORD
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cons,more,nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Sep 04 2004
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EXTENSIONS
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Corrected and extended by Ryan Propper (rpropper(AT)stanford.edu), Jul 22 2006
Corrected offset R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 31 2009
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