|
|
A099185
|
|
Iterated octahedral numbers, starting at a(0) = 2.
|
|
1
|
|
|
|
OFFSET
|
0,1
|
|
COMMENTS
|
For additional terms see b-file.
|
|
REFERENCES
|
Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 50, 1996.
Dickson, L. E. History of the Theory of Numbers, Vol. 2: Diophantine Analysis. New York: Chelsea, 1952.
|
|
LINKS
|
|
|
FORMULA
|
a(0) = 2, a(n+1) = oct(a(n)) = (2*a(n)^3 + a(n))/3.
|
|
MATHEMATICA
|
RecurrenceTable[{a[0]==2, a[n+1]==(2 a[n]^3 + a[n])/3}, a, {n, 6}] (* Vincenzo Librandi, Sep 16 2018 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn,less
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|