# [Stax](https://github.com/tomtheisen/stax), <s>26</s> 24 [bytes](https://github.com/tomtheisen/stax/blob/master/docs/packed.md#packed-stax) Ç╕SôεPN^:·░ßⁿ {@ÿ}Ü╫╣1╣X [Run and debug it](http://stax.tomtheisen.com/#p=80b85393ee504e5e3afab0e1fc207b40987d9ad7b931b958&i=[1,10]%0A[0,1]%0A[2,1]%0A[2,3]%0A%0A[61,86]%0A[75,90]%0A[34,74]%0A[59,81]%0A[84,85]%0A%0A[19,46]+%0A[60,81]+%0A[41,42]++%0A[13,81]+%0A[31,50]++%0A[15,42]%0A[94,99]+%0A[72,66]%0A[3189,826]++%0A%0A[15,3]%0A[22,51]+%0A[74,85]+%0A[27,31]+%0A%0A[123,0]++%0A[111,0]+%0A[111,222]+++++%0A%0A[33345,692]%0A[3894621507,5981921703]%0A[765432099,111111111]%0A%0A[1976,123]%0A&a=1&m=2) **Explanation** E{b+}99*L{E%2>|cd_E:-u%1=!C_Qf # Full program, unpacked, implicit input E # Push all elements from array onto stack. {b+}99*L # Generate the first 99 numbers of the Fibonacci sequence given the input { f # Loop through all Fibonacci elements E # Array of decimal digit %2> # Does the array have at least 3 digits |c # Assume Truthy past this point d # discard top of stack _E # Copy the current element of the Fibonacci sequence and Digitize it :- # Pairwise difference of array. :u # Is there exactly 1 unique number !C # Flip the comparison, if truthy proceed _Q # Copy the current element of the Fibonacci sequence and Peek and print with a newline. Not as short as I would like it and can probably be golfed a bit more, but it works.