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A138130 Powers of 1729, the Hardy-Ramanujan number. 1
1, 1729, 2989441, 5168743489, 8936757492481, 15451653704499649, 26715909255079893121, 46191807102033135206209, 79865634479415290771535361, 138087682014909037743984639169, 238753602203777726259349441123201, 412804978210331688702415183702014529 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
About 1729: "No," said Ramanujan, "It is a very interesting number..."
REFERENCES
David Wells, The Penguin Dictionary of Curious and Interesting Numbers. Penguin Books, NY, 1997, 153.
LINKS
Wikipedia, 1729 (number)
FORMULA
a(n) = 1729^n.
From Chai Wah Wu, Jan 19 2021: (Start)
a(n) = 1729*a(n-1) for n > 0.
G.f.: 1/(1 - 1729*x). (End)
MATHEMATICA
1729^Range[0, 9] (* Alonso del Arte, Oct 18 2014 *)
PROG
(PARI) a(n)=1729^n \\ Charles R Greathouse IV, Jan 20 2014
CROSSREFS
Sequence in context: A033502 A277366 A050794 * A306657 A048949 A339909
KEYWORD
nonn,easy
AUTHOR
Omar E. Pol, Mar 09 2008
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)