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All Topics Algebra Calculus Number Theory Combinatorics Applied Math
Number Theory
★ ★★★★

Cyclic Group Addition

In the modulo arithmetic ring $\mathbb{Z}_{17}$, compute the least non-negative residue of: $$(14 + …

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Number Theory
★ ★★★★

Divisibility by 9

What is the smallest single-digit positive integer $x$ such that the five-digit number $1234x$ …

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Number Theory
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Prime Summation

Evaluate the sum of the first five prime numbers in $\mathbb{N}$.

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Number Theory
★ ★★★★

Small Power Tower

Solve for $x$: $$x = 2^{2^3}$$ Hint: Is $2^{(2^3)}$ the same as $(2^2)^3$?

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Number Theory
★★ ★★★

Base-10 Divisibility

A checksum algorithm generates the base-10 integer $N = 458x2$, where $x$ is a …

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Number Theory
★★ ★★★

Orbital Periodicity

Two celestial bodies orbit a star with periods of 12 and 18 local years, …

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Number Theory
★★ ★★★

Root Identity

Evaluate the expression: $$\frac{2}{\sqrt{2}}$$

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Number Theory
★★★ ★★

Logarithm of i

Solve for $x$: $$x = \ln(i)$$ Format: i*[fraction]

+40 XP
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Number Theory
★★★ ★★

Modular Exponentiation

What is the last digit of $7^{2026}$?

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Number Theory
★★★ ★★

The Frobenius Coin Problem

Given two coprime token denominations of 7 and 12, what is the strictly largest …

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Number Theory
★★★★ ★

Cryptographic Modular Inverse

In the context of public-key cryptography, find the unique modular multiplicative inverse $x \in …

+80 XP
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Number Theory
★★★★ ★

Euler's Identity Application

Calculate the principal real value of $i^i$. Format: e^(-pi/X)

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Number Theory
★★★★ ★

Euler's Totient Function

Evaluate $\phi(40)$, which represents the number of integers $k$ in the range $1 \le …

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Number Theory
★★★★★

Complex Cosine

Solve: $$\cos(x) = i$$ Format: [fraction] - i ln([term])

+160 XP
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Number Theory
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Complex Sine Solution

Calculate the principal value for: $$\sin(x) = 2$$ Format: X/Y - i*Z

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Number Theory
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Legendre's Formula

Calculate the exact number of trailing zeros in the decimal representation of $100!$ (100 …

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Number Theory
★★★★★

The Basel Problem

Evaluate the exact sum of the infinite series: $$\sum_{n=1}^{\infty} \frac{1}{n^2}$$ Format: pi^2/X

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Number Theory
★★★★★

Wilson's Theorem

Determine the least non-negative residue of $16! \pmod{17}$.

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