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Questions Tagged with "elementary number theory" (Page 5)

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Generalized Collatz: divide out by $2$’s and $3$'s, otherwise $5n+1?$

0 answer

Mathematics Asked 3 years ago by Rivers McForge

Let $n$ be an integer. If the tens digit of $n^2$ is 7, what is the units digit of $n^2$?

6 answer

Mathematics Asked 3 years ago by user713999

Does $n$ divide $2^{n-1} - 1$ for an infinite number of composite $n$?

1 answer

Mathematics Asked 3 years ago

Is $h(n)$ independent of $n$?

1 answer

Mathematics Asked 3 years ago by Infinity_hunter

Functions that satisfy $f(n) = sum_{d|n, dneq n} f(d)$ and $f(1) = 1$

1 answer

Mathematics Asked 3 years ago by Matt Frank

Determine the smallest positive integer n, which has exactly 144 distinct divisors and there are 10 consecutive integers among these divisors.

1 answer

Mathematics Asked 3 years ago by AdhirajSinghBrar

For primes, $p_1 + p_2 +p_3+p_4 = p_1 p_2 p_3 p_4 - 15$

4 answer

Mathematics Asked 3 years ago by vlnkaowo

Unique representation: $a!cdot b!cdot c!=m!cdot n!cdot p!$

4 answer

Mathematics Asked 3 years ago by felipeuni

Solutions to the Diophantine equation

3 answer

Mathematics Asked 3 years ago by highgardener

Doubt on showing that when $p$ is prime, the only unipotent class is $p-1$?

1 answer

Mathematics Asked 3 years ago by Billy Rubina

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