A071346 a(n) = least positive r <= n, such that the origin-centered 4d-sphere of radius sqrt(r) touches A071345(n) lattice points.

1, 3, 9, 14, 18, 30, 42, 54, 78, 90, 114, 126, 150, 186, 210, 210, 270, 270, 330, 390, 390, 450, 510, 570, 570, 630, 630, 630, 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)=14 because the smallest 4d-sphere to touch A071345(5)=192 points has radius sqrt(14).

Prog

(FORTRAN) See A071339.

Crossrefs

Cf. A071339-A071347.

Sequence in context: A310324 A092476 A291641 * A103813 A001968 A305373

Adjacent sequences: A071343 A071344 A071345 * A071347 A071348 A071349

Keyword

easy,nonn

Author

Hugo Pfoertner, May 22 2002

Extensions

Edited by Don Reble, Nov 06 2005

Status

approved