Doing the exact same thing in the positive direction............gives u another interesting set of numbers........................i.e.............................3, 5, 7, 9................etc.......which is the same as the differences of squares........why?  Because..................overlaying............2 with 1 gives u 3................3 with 2 gives you 5...................etc.........................there are 7 primes in the 1st 10 numbers via overlap................................................3, 5, 7, 9, 11, 13, 15, 17, 19, 21.........................3, 5, 7, 11, 13, 17, 19 are prime..........7 of them.....................also imp................b/c 7 out of the 1st 10 terms of the harmonic series...........................make their own geo series...........................why else is that imp...........6.5 is dead center.................the average, etc.........of 2 - 11.................6.5 is between 6 and 7..................6 is the 1st perfect number.....................there are 6.28 pi radians in a full circle..........with a radius of one......................................combining the 1st two perfect numbers................but I am making this up...............