You count them luv ya !!x
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There are 25 prime numbers up to 100.
One and ten million. It would take up far too much time to spell the lot.
23 + 3 + 3 5 + 7 + 17
You can look up vanity numbers on sites for regular phone numbers as well as vanity numbers. Vanity Number Look Up will help you form words that your telephone number can spell or check the availability of toll free numbers. Another site is Toll Free Numbers, which also allows you to check availability on vanity numbers.
I did it with numerical analysis ('plug & chug') and got: 8.736103 & -13.736103 I was working out a formula, but made a mistake and came up with imaginary numbers as a solution which didn't seem right.