What is the prime Ulam #'s ratio?

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What are Ulam #'s? A ulam #, if an only if it can be written uniquely as the sumof two distinct Ulam #'s. ?

I need to make a list of the firts 20 Ulam #'s. I got the first 8. It's there any formanula or something easy to do it?

How many Ulam number are thre? Prove answer




EXTRA HELP!

Write a program that will generate all Ulam #'s less than a given number n. Use your progam to find all the Ulam numbers less than 1000. I am not good with calculator plus I don't have manual, I have a TI-83.:confused:

How many are there? ?

What portion of these are prime? Prime is a number divisible by one and by itself only... right?
 
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