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1,7

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.

Floor(n/(2+sqrt(2))).

With[{c=2+Sqrt[2]}, Table[Floor[n/c], {n, 80}]] (* Harvey P. Dale, Jun 21 2017 *)

Cf. A183140.

Sequence in context: A060065 A057356 A172274 * A020913 A025787 A057810

Adjacent sequences: A183135 A183136 A183137 * A183139 A183140 A183141

nonn

Clark Kimberling, Dec 26 2010

approved