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As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).
[[Category:Number templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Number templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
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Cellphone numbers are assigned the 1-digit area code 6, leaving eight digits for the subscriber's number: 06-CBBBBBBB, where subscriber's number ('C') is neither 6 nor 7. Service numbers (area codes 800, 900, 906 and 909) have either 4 or 7 remaining digits, making them 8 or 11 digits in total: 0AAA-BBBB or 0AAA-BBBBBBB. The area code 14 has no ...
To change this template's initial visibility, the |state= parameter may be used: {{Prime number classes | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Prime number classes | state = expanded}} will show the template expanded, i.e. fully visible.
Category:Number templates This page was last edited on 2 December 2024, at 01:42 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
Template documentation. See also. ISO standards This page was last edited on 22 November 2022, at 04:32 (UTC). Text is available under the Creative Commons ...
No description. Template parameters [Edit template data] This template prefers block formatting of parameters. Parameter Description Type Status No parameters specified The above documentation is transcluded from Template:Number sign/doc. (edit | history) Editors can experiment in this template's sandbox (create | mirror) and testcases (create) pages. Add categories to the /doc subpage ...