40 - 60..................a 20 number span................40/60........when factored by 20..............becomes.......2/3..........................like the beg of the primes.............the square root of 13..............is the hyp of a right triangle.......whose lesser sides are 2 and 3........the 5 primes........in the span of 40 - 60.................3 in the 1st ten................2 in the 2nd ten.......................reflex sym....with 2 and 3....................AND a 13 backwards.........or the start of pi...............3 in the 1st ten.........fractal patterns................................galore................40 - 60...................I got from using 2 and 5 as simple sieves.........b/c in any ten number sequence..........from a 0 to a 0.........zeros Dr. Riemann.........2 cuts out every even number........any number ending in a 2, 4, 6, 8, or a zero.................5 cuts out every number ending in 5.........they overlap at the 0.........................another clue...........so......2, 4, 5, 6, 8....or a number ending in 0.......cannot be prime............above ten...............that is 6 numbers.......like 6...........the 1st perfect number.........like the gold ratio.....................that leaves 4 numbers.......1, 3, 7, and 9..............four numbers................put in %'s.................2 and 5.......cut out 60% of the number line.....above ten from ever being prime.........leaving 40%..............40 - 60................a 20 number span.........like 2..........................a double fundamental maybe??  2 AND 2 - 11.......................4 d.......Dr. Riemann..........I bet it is........................2 tens..........20........................the 1st 5 primes......sum to 28..........the 1st 5 non primes sum to 37.............adding single digits to double digits.........for each sum..........give you 2 10s................maybe u do not see it.............