A235142 Numbers k such that A235141(k) = -1.

4, 10, 22, 32, 64, 84, 108, 132, 186, 214, 284, 360, 446, 490, 590, 642, 694, 746, 930, 990, 1192, 1266, 1342, 1568, 1738, 2086, 2180, 2276, 2470, 2572, 2668, 2780, 3326, 3556, 3680, 3922, 4298, 4430, 4560, 4832, 4968

Offset: 1

Author

Rajan Murthy, Jan 03 2014

Keywords

• nonn

Comments

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

Examples

			For n = 2, a(2) = 10.  The 10th term of A235141 is -1 corresponding to the square radius of an origin centered circle increasing from the open interval(5,8) to exactly 8.
		

Crossrefs

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

Cf. A235141, A234300.

Formula

a(n) = A235386(n+1) - 1.