olymmath

IL-GILLIS 2020 Problem 4

    At the start of the day, the four numbers (a0,b0,c0,d0)(a_0,b_0,c_0,d_0) were written on the board. Every minute, Danny replaces the four numbers written on the board with new ones according to the following rule: if the numbers written on the board are (a,b,c,d)(a,b,c,d) , then Danny first calculates the numbers \begin{align*} a'&=a+4b+16c+64d b'&=b+4c+16d+64a c'&=c+4d+16a+64b d'&=d+4a+16b+64c \end{align*} and replaces the numbers (a,b,c,d)(a,b,c,d) with the numbers (a′d′,c′d′,c′b′,b′a′)(a'd',c'd',c'b',b'a') . For which initial quadruples (a0,b0,c0,d0)(a_0,b_0,c_0,d_0) , will Danny write at some point a quadruple of numbers all of which are divisible by 578057805780^{5780} ?

    Dataset text AI-MO AoPS. Quoted with source.

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