A071346 -id:A071346 - cp's OEIS frontend

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

Hugo Pfoertner, May 22 2002

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

Cf. A071339-A071346.

FORTRAN
```
See A071339.
```

Edited by Don Reble, Nov 06 2005

A071343 a(n) = least positive r <= n, such that the origin-centered sphere of radius sqrt(r) touches A071342(n) lattice points.

Original entry on oeis.org

1, 2, 9, 14, 14, 26, 41, 41, 74, 89, 101, 101, 146, 194, 194, 194, 269, 314, 341, 341, 341, 446, 446, 446, 614, 626, 689, 689, 794, 854, 941, 941, 941, 1154, 1154, 1286, 1361, 1361, 1361, 1361, 1634, 1634, 1781, 1889, 1889, 1889, 2141, 2141

Offset: 1

Hugo Pfoertner, May 22 2002

			a(5)=14 because the smallest sphere to touch A071342(5)=48 points has radius sqrt(14).

Cf. A071339, A071340, A071341, A071342, A071343, A071344, A071345, A071346, A071347. A071609.

FORTRAN
```
See A071339.
```

Edited by Don Reble, Nov 06 2005

cp's OEIS Frontend

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

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