Wouf' s Blog

Many people of us forgot mathematical knowledge coming from the school. Nonetheless, some elements, a bit magical are deeply inked: The first numbers are part, for some of this substantifique marrow

For others, a first number is an only divisible number by 1 and by him even.

For example 13 am first, because only 1 and 13 he separate; on the contrary 14 am not first (2 divide 14)

In every New Year, the part of my brain which is devoted to mathematics asks question to know if this vintage is first or not.

credit photo: draggin

I am born in 1967. Contrary to the fact that it would be possible to think of 1967 am not first: 1967=7 * 281.

In fact untill today on 1973, on 1979, on 1987, on 1993, on 1997, 1999 and 2003 were first numbers.

And on 2009 then?

credit photo: gadl

And good not! 2009 is not first: 2009=7*7*41

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