62 (number)

Template:Infobox number 62 (sixty-two) is the natural number following 61 and preceding 63.

In mathematics

File:Square-sum-62.png

62 as the sum of three distinct positive squares.

62 is:

• the eighteenth discrete semiprime (<math>2 \times 31</math>) and tenth of the form (2.q), where q is a higher prime.
• with an aliquot sum of 34; itself a semiprime, within an aliquot sequence of seven composite numbers (62,34,20,22,14,10,8,7,1,0) to the Prime in the 7-aliquot tree. This is the longest aliquot sequence for a semiprime up to 118 which has one more sequence member. 62 is the tenth member of the 7-aliquot tree (7, 8, 10, 14, 20, 22, 34, 38, 49, 62, 75, 118, 148, etc).
• a nontotient.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

• palindromic and a repdigit in bases 5 (222₅) and 30 (22₃₀)
• the sum of the number of faces, edges and vertices of icosahedron or dodecahedron.
• the number of faces of two of the Archimedean solids, the rhombicosidodecahedron and truncated icosidodecahedron.
• the smallest number that is the sum of three distinct positive squares in two (or more) ways, <math>1^2+5^2+6^2 = 2^2+3^2+7^2</math> <ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

• the only number whose cube in base 10 (238328) consists of 3 digits each occurring 2 times.<ref>{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

• The 20th & 21st, 72nd & 73rd, 75th & 76th digits of pi.<ref name=":0">{{#invoke:citation/CS1|citation

|CitationClass=web }}</ref>

Square root of 62

As a consequence of the mathematical coincidence that 10⁶ − 2 = 999,998 = 62 × 127², the decimal representation of the square root of 62 has a curiosity in its digits:<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

<math>\sqrt{62}</math> = 7.874 007874 011811 019685 034448 812007 ...

For the first 22 significant figures, each six-digit block is 7,874 or a half-integer multiple of it.

7,874 × 1.5 = 11,811

7,874 × 2.5 = 19,685

The pattern follows from the following polynomial series:

<math display="block">\begin{align}

(1-2x)^{-\frac{1}{2}} &= 1 + x + \frac{3}{2}x^2 + \frac{5}{2}x^3 + \frac{35}{8}x^4 + \frac{63}{8}x^5 + \cdots \end{align} </math>

Plugging in x = 10⁻⁶ yields <math>\frac1{\sqrt{999,998}}</math>, and <math>\sqrt{62}</math> = <math>{7,874} \times \frac1{\sqrt{999,998}}</math>.