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124 lines
2.3 KiB
Markdown
124 lines
2.3 KiB
Markdown
---
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id: 6821ebc9237de8297eaee78f
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title: "Challenge 13: Unnatural Prime"
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challengeType: 29
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dashedName: challenge-13
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---
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# --description--
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Given an integer, determine if that number is a prime number or a negative prime number.
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- A prime number is a positive integer greater than 1 that is only divisible by 1 and itself.
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- A negative prime number is the negative version of a positive prime number.
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- `1` and `0` are not considered prime numbers.
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# --hints--
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`is_unnatural_prime(1)` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(1), False)`)
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}})
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```
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`is_unnatural_prime(-1)` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(-1), False)`)
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}})
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```
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`is_unnatural_prime(19)` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(19), True)`)
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}})
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```
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`is_unnatural_prime(-23)` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(-23), True)`)
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}})
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```
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`is_unnatural_prime(0)` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(0), False)`)
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}})
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```
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`is_unnatural_prime(97)` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(97), True)`)
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}})
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```
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`is_unnatural_prime(-61)` should return `True`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(-61), True)`)
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}})
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```
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`is_unnatural_prime(99)` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(99), False)`)
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}})
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```
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`is_unnatural_prime(-44)` should return `False`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertIs(is_unnatural_prime(-44), False)`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def is_unnatural_prime(n):
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return n
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```
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# --solutions--
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```py
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def is_unnatural_prime(n):
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abs_n = abs(n)
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if abs_n <= 1:
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return False
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for i in range(2, int(abs_n ** 0.5) + 1):
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if abs_n % i == 0:
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return False
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return True
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```
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