Category:81 (number)

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8.svg1.svgnumber:81 (eighty-one)
instance of:natural number, odd number, square number, centered octagonal number, heptagonal number and composite number
other integers:61 • 62 • 63 • 64 • 65 • 66 • 67 • 68 • 69 • 70 • 71 • 72 • 73 • 74 • 75 • 76 • 77 • 78 • 79 • 80 • 81 • 82 • 83 • 84 • 85 • 86 • 87 • 88 • 89 • 90 • 91 • 92 • 93 • 94 • 95 • 96 • 97 • 98 • 99 • 100 • 101
-20 • 0 • 10 • 20 • 30 • 40 • 50 • 60 • 70 • 80 • 90 • 100 • 110 • 120 • 130 • 140 • 150 • 160 • 170 • 180 • 190 • 200 • 210 • 220 • 230 • 240 • 250 • 260 • 270 • 280
81 
natural number
Wikipedia-logo-v2.svg Wikipedia
Instance ofnatural number (82, 80),
odd number (83, 79),
square number (64, 100),
centered octagonal number,
heptagonal number,
composite number
Authority control
Wikidata
Blue pencil.svg

Subcategories

This category has the following 11 subcategories, out of 11 total.

 

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Media in category "81 (number)"

The following 4 files are in this category, out of 4 total.