Jun 26, 2021 · I had a reputation of 1209 a few days before, and out of silly curiosity I thought of just checking in Numbermatics about the specialties of the number and ended up seeing its …

Feb 16, 2018 · I was looking around on the internet until I stumbled upon this equation. $$111111111\\times111111111 = 12345678987654321$$ How does this actually work? It is …

Aug 19, 2021 · We are to find the value of 5.5 + 55.55 + 555.555 + ⋯ 5.5 + 55.55 + 555.555 + from the first term until the n n th term. Now, as you did, it can be factored into 5(1.1 + 11.11 + …

Dec 31, 2019 · @Adam I was curious about what you were referring too and having looked through your answers I see you must be referring to your answers here and here. There is no …

While messing around, I noticed that across some prime numbers contain only sequentially increasing digits, e.g. $23, 67, 89,23456789$. If we adopt a convention of returning to $1$ …

Dec 21, 2022 · Division is the inverse operation of multiplication, and subtraction is the inverse of addition. Because of that, multiplication and division are actually one step done together from …

Dec 24, 2025 · I found this problem in a problemset of my school and it stated that one should build such function $g$. However I think that this is not possible given that by ...

Aug 1, 2021 · The concept of the distributional derivative is much weaker than that of a weak derivative. I think it's best to explain this in one dimension. Concerning your second question: …

Oct 9, 2017 · I don't entirely agree with these comments that facts relating to particular number bases are uninteresting and just for entertainment. Are primes with just two non-zero base 2 …

Can you please explain to me how to get from a nonparametric equation of a plane like this: $$ x_1−2x_2+3x_3=6$$ to a parametric one. In this case the result is supposed to be $$ x_1 = 6 …