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A083051(n)=2*n+1+floor(n*sqrt(2)) is the location of the least k for which a(k)=n.
Table of n, a(n) for n=1..71.
Sequence in context: A060065 A057356 A172274 * A020913 A025787 A057810
Adjacent sequences: A183135 A183136 A183137 * A183139 A183140 A183141
Clark Kimberling, Dec 26 2010