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Joined 1 year ago
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Cake day: June 19th, 2023

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  • It works differently for each number. For 2, the last number has to be divisible by 2. For 3, the sum of the digits has to be divisible by 3 For 5, the number has to end with a 0 or a 5. For 7, it is kinda tricky. Take the last digit, double it, and subtract it from the numbers on the left. If the remainder is 0 or divisible by 7, the whole number is divisible by 7. For example 49: 9×2=18, 4-18=-14, -14/7=2 with remainder 0. For 700, 0×2=0, 70-0=70, 70/7=10 remainder 0.

    This is usually specified for prime numbers, for non-prime number, you just do calculate the prime components of a number and combine the rules.

    For example, divisibility by 15: it has to be divisible by 3 and 5. 1+5=6, 6/3=2 remainder 0. 15 ends with a 5. For number where with multiple same prime components the rules for these duplicate numbers have to apply multiple times. Like for 25, it has to end with a 5 or 0, and when dividing the number by 5, the result has to end with a 5 or a 0 aswell.












  • I mean, GDPR is a fucking disaster. Nobody is getting it right, same with cookie consent. This is because the last time geriatric imbeciles at the European parliament seen a computer was back at 98.

    Since all those people are using it, it kinda doesn’t matter for them. As if not having their data harvested from every single click makes them not care about GDPR and the other bullshit. What a surprise.