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2026-07-13 11:55:53 +08:00

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---
id: 68d30845cc08266018fc46be
title: "Challenge 78: Integer Sequence"
challengeType: 29
dashedName: challenge-78
---
# --description--
Given a positive integer, return a string with all of the integers from `1` up to, and including, the given number, in numerical order.
For example, given `5`, return `"12345"`.
# --hints--
`sequence(5)` should return `"12345"`.
```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(sequence(5), "12345")`)
}})
```
`sequence(10)` should return `"12345678910"`.
```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(sequence(10), "12345678910")`)
}})
```
`sequence(1)` should return `"1"`.
```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(sequence(1), "1")`)
}})
```
`sequence(27)` should return `"123456789101112131415161718192021222324252627"`.
```js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(sequence(27), "123456789101112131415161718192021222324252627")`)
}})
```
# --seed--
## --seed-contents--
```py
def sequence(n):
return n
```
# --solutions--
```py
def sequence(n):
result = ""
for i in range(1, n + 1):
result += str(i)
return result
```