A071374 0 iff n is of the form 4^a*(8k+7), otherwise 1.

1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 1

Offset

0,1

Comments

0 iff n is not the sum of three squares.

Links

Table of n, a(n) for n=0..98.

J.-P. Allouche and J. Shallit, The ring of k-regular sequences, preprint.

J.-P. Allouche and J. Shallit, The ring of k-regular sequences, Theoretical Computer Sci., Vol. 98 (1992), pp. 163-197.

Index entries for 2-automatic sequences.

Crossrefs

1's complement to A072401. Cf. A071377.

Sequence in context: A212793 A307420 A129667 * A071025 A077010 A330548

Adjacent sequences: A071371 A071372 A071373 * A071375 A071376 A071377

Keyword

nonn

Author

N. J. A. Sloane, Jun 12 2002

Status

approved