Is the 'rand' function in Calc truly random?

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The OP may be interested in comparing the randomness of the RNG functions from Calc, QuattroPro and Excel (recently in the news). I can not address that question, but perhaps someone else can.

Is that https://gizmodo.com/canadas-random-im... If so, then that's just plain wrong, since although Excel does use a pseudo-random generator (the same as we do, afaik), it is the generated sequence distribution characteristic that matters (and it's fine), and it's wrong that "If you know one number at one step, you can compute all the numbers that will follow" - that "Prof. L’Ecuyer"'s citation is just a BS.

The crucial part is "If you know one number at one step" so yes, if the PRNG is seeded with the same value in each initialization then the same sequence repeats in all runs. But LibreOffice uses std::random_device and time to seed. One can of course compute all sequences for all possible seed values and then take the last some generated numbers to lookup that partial sequence in those tables to predict subsequent numbers.