

A106029


a(n) is the number of orbits under the action of GL_2[Z] on the primitive binary quadratic forms of discriminant D, where D=m if m=1 (mod 4), D=4*m otherwise and m<0 is the nth squarefree number.


0



1, 1, 1, 2, 2, 1, 2, 1, 2, 3, 2, 3, 1, 4, 2, 2, 4, 4, 4, 2, 4, 3, 2, 2, 4, 3, 5, 4, 1, 3, 3, 2, 4, 3, 4, 2, 2, 4, 5, 6, 6, 1, 6, 4, 4, 3, 6, 6, 4, 3, 3, 2, 4, 6, 4, 7, 2, 4, 5, 5, 3
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OFFSET

1,4


COMMENTS

A000924 is the same except it is under the action of SL_2[Z].


LINKS



EXAMPLE

m = 1, 2, 3, 5, 6, 7, 10, 11, 13, ...
with corresponding discriminant
D = 4, 8, 3, 20, 24, 7, 40, 11, 52, ....


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



