A087819 z values corresponding to A087818.

0, 2, 0, 3, 4, 4, 5, 6, 5, 6, 0, 7, 6, 8, 8, 0, 9, 8, 9, 10, 10, 8, 9, 0, 11, 11, 12, 10, 12, 11, 12, 13, 10, 13, 12, 14, 14, 14, 12, 15, 13, 15, 14, 16, 15, 16, 13, 14, 16, 15, 17, 17, 13, 14, 18, 18, 16, 18, 17, 0, 19, 15, 18, 19, 17, 19, 20, 18, 20, 15, 20, 17, 0, 21, 20, 21, 19, 21

Offset

1,2

Links

Table of n, a(n) for n=1..78.

Prog

(PARI) fourkp1(n) = { forstep(x=1, n, 4, for(y=1, sqrtint(x), my(z=x-y^2); if(issquare(z), print1(sqrtint(z)", "); break; ) ) ) }

Crossrefs

Sequence in context: A300001 A137218 A306765 * A290820 A392311 A278029

Adjacent sequences: A087816 A087817 A087818 * A087820 A087821 A087822

Keyword

nonn

Author

Cino Hilliard, Oct 06 2003

Status

approved