Fun fact: 199 is the smallest number you can't reach with this calculator, followed by 202 and 206 along with primes bigger than or equal to 211.
Reason: 199 is prime so you can only get it with addition but the highest possible addition is 99 + 99 = 198. 202 and 206 are two times a prime larger than 100, again not doable due to the limitations.
Also, it doesn't work very well on Firefox, had to use Chrome.
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answer: version 124.0.2 but it was on a Mac, maybe that is the problem?