Find all accumulation points of the set whose elements in form $2^{-n}+5^{-m}, m,n\in\mathbb N^+$
109224
Accumulation points of $\{ 2^{-n} + 5^{-m} : n,m \geq 1 \}$
106455
intersection of infinite collection of finite sets?
67926
$S_n$ is generated by elements of the form $(1k)$
72402
Summation of natural number set with power of $m$
5448
Finding the closure of some subsets of the ordered square
25769
Finding all posets on a set
59134
Proving idempotent elements in $\mathbb{Z}_n$
112120
Find all primes of the form $2^{2^n} + 5$ for a nonnegative integer n
152342
$x_1+x_2+\cdots+x_n\leq M$: Cardinality of Solution Set is $C(M+n, n)$
77799
Determine the set of units $(\Bbb Z/n\Bbb Z)^\times$ for different values of $n$
95031
Find generators of the ideal of an algebraic set
146436
Cardinality of the set of bijective functions on $\mathbb{N}$?
132605
Finding the number of subsets of a set such that an element divides the succeeding element.
76652
Finding the maximum $lcm$ of a set of numbers with sum $n$
8884
Find all natural numbers $n$ and $m$ for which $n^m=(n-1)!+1$
145214
Showing the power set is equinumerous to ${}^X2$
132068
Write the set $\{1, 6, 11, 16,\ldots\}$ in compact (concise) notation.