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Published byRolf Kelly Modified over 8 years ago

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The Newest Prime Number An Investigation

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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?

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

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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

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

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