|
Search: id:A144928
|
|
| |
|
| 49, 53441, 5878461, 646577269, 71117621129, 7822291746921, 860380974540181, 94634084907672989, 10408888958869488609, 1144883151390736074001
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n+2)=110*a(n+1)-a(n) [From Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 16 2008]
a(n)=(49/2)*{[55+12*sqrt(21)]^n+[55-12*sqrt(21)]^n}+(25373/252)*sqrt(21)*{[55+12*sqrt(21)]^n-[55-12*sqrt(21)]^n }, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Nov 25 2008]
|
|
EXAMPLE
|
a(1)=49 because (7+7)^3-7^3=49^2 [From Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 16 2008]
|
|
CROSSREFS
|
Sequence in context: A145251 A013741 A100418 this_sequence A134725 A013843 A023936
Adjacent sequences: A144925 A144926 A144927 this_sequence A144929 A144930 A144931
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Richard Choulet (richardchoulet(AT)yahoo.fr), Sep 25 2008
|
|
EXTENSIONS
|
Numbers k such that exists x in N : (x+7)^3-x^3=k^2 Richard Choulet (richardchoulet(AT)yahoo.fr), Oct 16 2008
|
|
|
Search completed in 0.002 seconds
|
