A071374 - OEIS

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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

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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.