OFFSET
0,2
COMMENTS
The sequence can be defined as follows: a(0) = 0, a(n+1) = b(a(n)) where b(n) = n + 2*Q(n+4) + 1 (Q is given in A010052)
REFERENCES
R. M. Robinson, Primitive Recursive Functions, Bulletin of the American Mathematical Society, Vol. 53 (1947), pp. 925-942.
FORMULA
a(n) = n + 2*floor(sqrt(n)) = n+2*A000196(n).
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel E. Severin (danielseverin(AT)yahoo.es), Dec 24 2005
STATUS
approved