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A099185
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Iterated octahedral numbers, starting at a(0) = 2.
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1
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OFFSET
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0,1
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COMMENTS
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For additional terms see b-file.
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REFERENCES
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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.
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LINKS
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FORMULA
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a(0) = 2, a(n+1) = oct(a(n)) = (2*a(n)^3 + a(n))/3.
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MATHEMATICA
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RecurrenceTable[{a[0]==2, a[n+1]==(2 a[n]^3 + a[n])/3}, a, {n, 6}] (* Vincenzo Librandi, Sep 16 2018 *)
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CROSSREFS
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KEYWORD
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easy,nonn,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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