About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 203. Chapters: 7 (number), 0 (number), 4 (number), 3 (number), 8 (number), 5 (number), 9 (number), Power of two, 12 (number), 42 (number), 6 (number), 11 (number), Natural number, Negative number, 10 (number), 10000 (number), 1000 (number), 17 (number), 13 (number), 300 (number), 400 (number), 153 (number), Integer, Names for the number 0 in English, 40 (number), Graham's number, 500 (number), 23 (number), 175 (number), 2000 (number), 900 (number), 181 (number), 16 (number), 14 (number), 188 (number), Almost integer, 47 (number), 185 (number), 27 (number), 184 (number), 600 (number), 192 (number), 172 (number), Repunit, 108 (number), 179 (number), 182 (number), Square number, 174 (number), 24 (number), 1138 (number), 176 (number), 193 (number), 189 (number), 196 (number), 700 (number), 173 (number), 171 (number), 186 (number), 195 (number), 177 (number), 144000 (number), 22 (number), 183 (number), 21 (number), 33 (number), 18 (number), Million, 15 (number), 36 (number), 60 (number), Signed zero, 28 (number), 41 (number), 20 (number), 800 (number), 156 (number), Cube (algebra), 30 (number), 155 (number), 167 (number), 178 (number), 100000 (number), 194 (number), 159 (number), 100 (number), 199 (number), 187 (number), 1729 (number). Excerpt: 7 (seven;) is the natural number following 6 and preceding 8. In fact, if one sorts the digits in the number 142857 in ascending order, 124578, it is possible to know from which of the digits the decimal part of the number is going to begin with. The remainder of dividing any number by 7 will give the position in the sequence 124578 that the decimal part of the resulting number will start. For example, 628/7= 89 + 5/7; here 5 is the remainder, and would correspond to number 7 in the ranking of the ascending sequence. So in this case, 628/7 = 89.714285. Another example, 5238/7 = 748 + 2/7, hence the remainder is 2, and this corresponds to number 2 in the sequence. In this case, 5238/7 = 748.285714. In quaternary, 7 is the smallest prime with a composite sum of digits. In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J vertically inverted. The western Ghubar Arabs' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the character more rectilinear. The eastern Arabs developed the character from a 6-look-alike into an uppercase V-look-alike. Both modern Arab forms influenced the European form, a two-stroke character consisting of a horizontal upper line joined at its right to a line going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line above the glyph. This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a
