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21 is also the first non-trivial octagonal number. [5] It is the fifth Motzkin number, [6] and the seventeenth Padovan number (preceded by the terms 9, 12, and 16, where it is the sum of the first two of these). [7] In decimal, the number of two-digit prime numbers is twenty-one (a base in which 21 is the fourteenth Harshad number).
A 21-gun salute is the most commonly recognized of the customary gun salutes that are performed by the firing of cannon or artillery as a military honor. As naval customs evolved, 21 guns came to be fired for heads of state, or in exceptional circumstances for heads of government, with the number decreasing with the rank of the recipient of the ...
A 21-gun salute is the most commonly recognized of the customary gun salutes that are performed by the firing of cannon or artillery as a military honor. As naval customs evolved, 21 guns came to be fired for heads of state, or in exceptional circumstances for heads of government, with the number decreasing with the rank of the recipient of the honor.
The same suffix may be used with more than one category of number, as for example the orginary numbers secondary and tertiary and the distributive numbers binary and ternary. For the hundreds, there are competing forms: Those in -gent- , from the original Latin, and those in -cent- , derived from centi- , etc. plus the prefixes for 1 through 9 .
Chromosome 21 is both the smallest human autosome and chromosome, [4] with 46.7 million base pairs (the building material of DNA) representing about 1.5 percent of the total DNA in cells. Most people have two copies of chromosome 21, while those with three copies of chromosome 21 (trisomy 21) have Down syndrome.
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The number seven was apparently the Egyptian symbol of such ideas as perfection, effectiveness, and completeness. Examples. Seven thousand barrels of red beer were used to trick Sekhmet out of killing. In her search for her husband's pieces, the goddess Isis was guarded by seven scorpions. A legendary famine lasted seven years.
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