2. The Newest Prime Number An Investigation

3. The Newest Prime Number The newest prime number is 2 1257787 - 1 If this number was to be written out in full what would the last two digits be?

4. Solution The table on the next slide shows how the solution is worked out.

5. nLast two digits of 2 n -1n 11 23 37 4152415 5312531 6632663 727 8552855 9112911 10233023 11473147 129532 139133etc 148334 156735 163536 177137 184338 1987 2075 2151 2203 2307

6. Solution Using the above table we see that the last two digits of 2 1257787 - 1 are 2 and 7 i.e. 27