Talk:Find largest left truncatable prime in a given base: Difference between revisions
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==Odd base optimization== |
==Odd base optimization== |
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Sadly 24 is not odd, but for bases which are: |
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:Note that all stems greater than 2 are odd. |
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:Prepending an odd number to the stem makes a new even candidate stem, which can not be prime. |
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Therefore it is only necessary to consider cases where the number prepended to the stem is even. |
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For 2 the situation is the reverese. |
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--[[User:Nigel Galloway|Nigel Galloway]] 12:27, 10 December 2012 (UTC) |
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