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108 lines
2.0 KiB
Markdown
108 lines
2.0 KiB
Markdown
---
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id: 69cfca90e8a0a6d4d6871c52
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title: "Challenge 268: Narcissistic Number"
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challengeType: 29
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dashedName: challenge-268
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---
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# --description--
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Given a positive integer, determine whether it is a narcissistic number.
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- A number is narcissistic if the sum of each of its digits raised to the power of the total number of digits equals the number itself.
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For example, 153 has 3 digits, and 1<sup>3</sup> + 5<sup>3</sup> + 3<sup>3</sup> = 153, so it is narcissistic.
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# --hints--
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`is_narcissistic(153)` 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_narcissistic(153), True)`)
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}})
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```
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`is_narcissistic(154)` 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_narcissistic(154), False)`)
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}})
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```
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`is_narcissistic(371)` 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_narcissistic(371), True)`)
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}})
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```
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`is_narcissistic(512)` 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_narcissistic(512), False)`)
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}})
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```
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`is_narcissistic(9)` 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_narcissistic(9), True)`)
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}})
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```
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`is_narcissistic(11)` 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_narcissistic(11), False)`)
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}})
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```
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`is_narcissistic(9474)` 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_narcissistic(9474), True)`)
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}})
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```
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`is_narcissistic(6549)` 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_narcissistic(6549), 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_narcissistic(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_narcissistic(n):
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digits = str(n)
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power = len(digits)
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return sum(int(d) ** power for d in digits) == n
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```
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