1,2

The positions reflect square radii which are uniquely twice a square integer, that is, the inclusion of only one square on the y = x line.

Table of n, a(n) for n=1..42.

a(n+1) = A235142(n) + 1 , a(1)=1.

for n=3, a(3) = 11. The eleventh term of A235141 is 1 reflecting an increase in the square radius of the circle from exactly 8 to the open interval of (8,9).

A000548(n) = (A001481(1 + (a(n+1)-1)/2)/2.

Cf. A235141, A234300.

Sequence in context: A167610 A295149 A143127 * A061769 A169744 A190148

Adjacent sequences: A235383 A235384 A235385 * A235387 A235388 A235389

nonn

Rajan Murthy, Jan 08 2014

approved