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Joined 1 year ago
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Cake day: August 15th, 2023

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  • Never realized there are so many rules for divisibility. This post fits in this category:

    Forming an alternating sum of blocks of three from right to left gives a multiple of 7

    299,999 would be 999 - 299 = 700 which is divisible by 7. And if we simply swap grouped digits to 999,299, it is also divisible by 7 since 299 - 999 = -700.

    And as for 13:

    Form the alternating sum of blocks of three from right to left. The result must be divisible by 13

    So we have 999 - 999 + 299 = 299.

    You can continue with other rules so we can then take this

    Add 4 times the last digit to the rest. The result must be divisible by 13.

    So for 299 it’s 29 + 9 * 4 = 65 which divides by 13. Pretty cool.





  • From article

    Reddit challenged its designation on the basis that it is mostly a text-based discussion platform, and links to videos uploaded elsewhere on the internet should not be factored in. The Irish regulator counter-argued that the audio-visual content on the platform is extensive, and pointed to its enormous reach, with 73 million daily users.

    Could not find any post statistics, but they probably are correct and percentage wise uploaded videos should be at the bottom, but total count probably is too large to be simply disregarded. Reddit probably has more videos than Vimeo which is purely video based. And if Reddit would be in the clear then so should be Twitter and Facebook since those too are primarily text based.










  • While it sounds ridiculous, there is a reasoning for this even nowadays:

    Any periodic activity with a rate faster than one minute incurs the scrutiny of the Windows performance team, because periodic activity prevents the CPU from entering a low-power state. Updating the seconds in the taskbar clock is not essential to the user interface, unlike telling the user where their typing is going to go, or making sure a video plays smoothly. And the recommendation is that inessential periodic timers have a minimum period of one minute, and they should enable timer coalescing to minimize system wake-ups.

    Found 1 test that seems to confirm battery life is slightly worse (2%) with seconds enabled. But this is true only when nothing is going on on screen. If you would actually work on PC, I imagine difference would be practically nonexistent.

    All that said, I use seconds on my private and work PC. Was pissed when MS initially removed this as an option.