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4

To directly answer your questions: 211 -201 There is an algorithm to construct the formula for a given integer, but to find all emoji-primes it is more efficient to compute all permutations instead. I've written a brute force implementation that outputs all possible formulae and emoji-primes: https://github.com/markhobson/emoji-primes The full results are ...


10

Here are my answers for the numbers I believe I have exhaustively enumerated all possible sequences; a proof that the preceding and following numbers are not constructable will be forthcoming.


3

Partial answer -- Feel free to use this for your own answer. I believe the solution for the first question is: Below I have a list of equations for positive integers up to that value. I've omitted over some of the values when the pattern can be surmised. 0 = 0 1 = 1 2 = 2 [...] 10 = 10 11 = 10 + 1 [...] 19 = 10 + 9 20 = 2 * 10 21 = 2 * 10 + 1 22 = 3 * 10 -...


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