A235386 Positions of A235141, the first differences of A234300, which equal 1.

1, 5, 11, 23, 33, 65, 85, 109, 133, 187, 215, 285, 361, 447, 491, 591, 643, 695, 747, 931, 991, 1193, 1267, 1343, 1569, 1739, 2087, 2181, 2277, 2471, 2573, 2669, 2781, 3327, 3557, 3681, 3923, 4299, 4431, 4561, 4833, 4969

Offset

1,2

Comments

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.

Links

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

Formula

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

Example

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).

Crossrefs

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

Keyword

nonn

Author

Rajan Murthy, Jan 08 2014

Status

approved