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Count to 1,000

155 is rumored to be having an affair with 154 and the latest scandal is the suggestion that there may be a little one between them :rolleyes:
 
I never knew of sexy prime's before, It sounds like a very camp transformer.

158 Gloucester St Christchurch Central, Christchurch

data=RfCSdfNZ0LFPrHSm0ublXdzhdrDFhtmHhN1u-gM,4RzUrD9Qp0ixdh7oXyG03PFi6jhMXYfbqnhysMk86SwATGl4ImlasK_vw9s37HSWG5B-VNUqUwOHpLB8kjTLo62Z89ZIvETPEFzEYPrGf4ea0ATMNf-Woyjeh9PKMe8CBsWYgoaCOpwaJaVCBpbVb43UpJ7Bn0lDwNN--VEbUd5xh_rEiY5IY0xpwK20_o1l-Ril-MILegj2e1jIxo-mYYetdd623VjR
 
An untouchable number is a positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself).

For example, the number 4 is not untouchable as it is equal to the sum of the proper divisors of 9: 1 + 3 = 4. The number 5 is untouchable as it is not the sum of the proper divisors of any positive integer: 5 = 1 + 4 is the only way to write 5 as the sum of distinct positive integers including 1, but if 4 divides a number, 2 does also, so 1 + 4 cannot be the sum of all of any number's proper divisors (since the list of factors would have to contain both 4 and 2).

The first few untouchable numbers are:

2, 5, 52, 88, 96, 120, 124, 146, 162, 188, 206, 210, 216, 238, 246, 248, 262, 268

162
 
Tree, what in the world are we looking at? Do we want to know ? :p

CLXIX

I don't know what you are looking at.
The diagram 168 in Post #171 = a drawing of
the left palatine bone, nasal aspect.
 

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