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A071347 a(n) = greatest positive r <= n, such that the origin-centered 4d-sphere of radius sqrt(r) touches A071345(n) lattice points. 8
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 23 03:10 EDT 2019. Contains 323507 sequences. (Running on oeis4.)