This HTML paper was written especially for

The straight line connecting points
< *i*^{2},-*i*>
and
< *j*^{2},*j* >
(lying on the parabolla *x*=*y*^{2}) crosses
the *x*-axis at the point with of abscissa *ij*.
Thus,
if
we
connect
all such points for *i*,*j*=2,3,..., then all composite
numbers
will
be
"crossed out" from the positive part of the axis of abscissas.

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| |

.eps |

The first author suggested to use the above stated
property
of
parabolla
for
constructing a nomogramm for multiplication in *Kvant*, 5(1971),
p.25, ISSN 0130-2221. The idea to use it for visualization of prime
numbers
is due to the seconf author.

The above graphic files were produced by MATHEMATICA.

This paper was put on WWW on February 14, 1999.