Talk:1
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 | A fact from this article appeared on Wikipedia's Main Page in the "Did you know?" column on October 17, 2024. The text of the entry was: Did you know ... that the number 1 is its own square, square root, and factorial? | |||||||||
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Semi-protected edit request on 17 January 2025
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Do roman numbers I=1 Busserler (talk) 08:13, 17 January 2025 (UTC)
Not done: Your request is not clear, but the the Roman numeral is already in the infobox Polyamorph (talk) 08:40, 17 January 2025 (UTC)
Linebreak problem
This article has many occurrences of expressions like: (<math>1!=1</math>). The problem is that the browser may put a linebreak between the closing 'math' tag and the right paren. Perhaps these should be <math>(1!=1)</math> ... I'm not sure, and hope there is a definitive answer. Imaginatorium (talk) 15:16, 29 December 2025 (UTC)
- @Imaginatorium. How about not to use the parentheses at all? Dedhert.Jr (talk) 07:16, 30 December 2025 (UTC)
Another property...
1 is one of 4 numbers that satisfy the relationship "n! is a number of n decimal digits". The others are 22, 23 and 24. ~2025-43833-86 (talk) 15:50, 30 December 2025 (UTC)
- Not sure I can understand this property. Can you elaborate? Dedhert.Jr (talk) 09:56, 31 December 2025 (UTC)
- 1! is 1 digits long. 22! is 22 digits long 23! is 23 digits long. 24! is 24 digits long. Wolfram Alpha (and a bit of common sense for 1!) agrees with the temporary account editor: 22!, 23!, 24!. I found this by googling "n! has n digits" but I'm not smart enough to understand what it says :( Source does look reliable though. --not-cheesewhisk3rs ≽^•⩊•^≼ ∫ (pester) 12:38, 8 February 2026 (UTC)
- WP:CALC almost applies, but it is also necessary to note that 25! happens to have more than 25 digits and, for n>25, n! will have more than n digits by induction because n! > (n-1)! × 10. That's bordering on not very original research and might need a source. However, I'm not sure this is an important property of the number 1, which is an exceptional case for many formulae. It might make a more relevant entry for 22 (number) or 24 (number). Certes (talk) 18:52, 8 February 2026 (UTC)
- If this is added to the other numbers where it applies, it would also be worth mentioning that 1 is also a number with this property. Though I do agree this isn't very important for 1, so doesn't need inclusion in this article. --not-cheesewhisk3rs ≽^•⩊•^≼ ∫ (pester) 20:24, 8 February 2026 (UTC)
- The article already states that 1 is its own factorial. I agree with Certes that it may be relevant to include in the other numbers that have this property (if not already there, I haven't looked). Polyamorph (talk) 20:14, 8 February 2026 (UTC)
- WP:CALC almost applies, but it is also necessary to note that 25! happens to have more than 25 digits and, for n>25, n! will have more than n digits by induction because n! > (n-1)! × 10. That's bordering on not very original research and might need a source. However, I'm not sure this is an important property of the number 1, which is an exceptional case for many formulae. It might make a more relevant entry for 22 (number) or 24 (number). Certes (talk) 18:52, 8 February 2026 (UTC)
- 1! is 1 digits long. 22! is 22 digits long 23! is 23 digits long. 24! is 24 digits long. Wolfram Alpha (and a bit of common sense for 1!) agrees with the temporary account editor: 22!, 23!, 24!. I found this by googling "n! has n digits" but I'm not smart enough to understand what it says :( Source does look reliable though. --not-cheesewhisk3rs ≽^•⩊•^≼ ∫ (pester) 12:38, 8 February 2026 (UTC)