A071347 a(n) = greatest positive r <= n, such that the origin-centered 4d-sphere of radius sqrt(r) touches A071345(n) lattice points.

1, 3, 9, 15, 18, 30, 42, 54, 78, 90, 114, 126, 150, 186, 210, 210, 270, 270, 330, 390, 390, 450, 510, 570, 594, 630, 630, 750, 810, 882, 930, 990, 1050, 1050, 1170, 1170, 1350, 1386, 1470, 1530, 1650, 1710, 1710, 1890, 1890, 1890, 1890, 2250, 2310

Offset

1,2

Links

Table of n, a(n) for n=1..49.

Example

a(4)=15 because the largest 4d-sphere with radius <= 4 to touch A071345(4)=192 points has radius sqrt(15).

Prog

(FORTRAN) See A071339.

Crossrefs

Cf. A071339-A071346.

Sequence in context: A310330 A071123 A298014 * A093414 A123998 A117105

Adjacent sequences: A071344 A071345 A071346 * A071348 A071349 A071350

Keyword

easy,nonn

Author

Hugo Pfoertner, May 22 2002

Extensions

Edited by Don Reble, Nov 06 2005

Status

approved