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Joined 2 years 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.









  • Soft bricked VS Hard bricked. Agree that it would be nicer to be more precise in headline, but both are technically under Bricked category.

    Regarding TOTP tokens, some time ago switched to Aegis app which allows token export in JSON which I store in Dropbox. I believe only thing that I would lose would be last photos that I have not backed up yet. And past Signal conversations which sometimes come useful.

    But for regular folks losing access to phone indeed seems like nightmare scenario for 2FA. I think MS Authenticatior backed tokens to your OneDrive if you enabled it in settings. Often these less secure options are good tradeoff for usability.

    Practically all my previous phones were either lost or stolen so it will be inevitable some day. Almost lost my current one year ago due to being drunk, luckily got it back.