A204999 a(n) = (1/n)*A204998(n).

3, 4, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 2, 1, 1, 3, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 3, 4, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 4, 1, 2, 1, 2, 1, 1, 1

Offset: 1

Author

Clark Kimberling, Jan 21 2012

Keywords

• nonn

Comments

For a guide to related sequences, see A204892.

Positions of 3's seem to be given by a subsequence of A104777. - Antti Karttunen, Sep 29 2018

Links

• Antti Karttunen, Table of n, a(n) for n = 1..23005

Crossrefs

Cf. A204996, A204997, A204998, A204892.

Programs

Mathematica

(See the program at A204994.)

PARI

A204999(n) = { my(d); for(k=sqrtint(1+n), oo, for(j=1,k-1,if(!((d=(k^2)-(j^2))%n),return(d/n),if(dAntti Karttunen, Sep 28 2018

Formula

a(n) = (A204996(n)-A204997(n))/n.

Extensions

More terms from Antti Karttunen, Sep 28 2018