7 (nombor)

Tujuh (7) ialah bilangan keenam selepas satu (1).

Dalam matematikSunting

Asas	Sistem angka
2	Perduaan	111
3	ternari	21
4	quaternari	13
5	quinari	12
6	senari	11
7	septenari	10
over 7 (perlapanan, perpuluhan, etc)		7

Dalam quaternary, 7 ialah nombor perdana terkecil dengan jumlah komposit digit.

Penggandaan	1	2	3	4	5	6	7	8	9	10		11	12	13	14	15	16	17	18	19	20		21	22	23	24	25		50	100	1000
$7\times x$	7	14	21	28	35	42	49	56	63	70		77	84	91	98	105	112	119	126	133	140		147	154	161	168	175		350	700	7000

Pembahagian	1	2	3	4	5	6	7	8	9	10
Pembahagian	11	12	13	14	15
$7\div x$	7	3.5	$2.{\overline {3}}$	1.75	1.4	$1.1{\overline {6}}$	1	0.875	$0.{\overline {7}}$	0.7
$7\div x$	$0.{\overline {6}}{\overline {3}}$	$0.58{\overline {3}}$	$0.{\overline {5}}3846{\overline {1}}$	0.5	$0.4{\overline {6}}$
$x\div 7$	$0.{\overline {1}}4285{\overline {7}}$	$0.{\overline {2}}8571{\overline {4}}$	$0.{\overline {4}}2857{\overline {1}}$	$0.{\overline {5}}7142{\overline {8}}$	$0.{\overline {7}}1428{\overline {5}}$	$0.{\overline {8}}5714{\overline {2}}$	1	$1.{\overline {1}}4285{\overline {7}}$	$1.{\overline {2}}8571{\overline {4}}$	$1.{\overline {4}}2857{\overline {1}}$
$x\div 7$	$1.{\overline {5}}7142{\overline {8}}$	$1.{\overline {7}}1428{\overline {5}}$	$1.{\overline {8}}5714{\overline {2}}$	2	$2.{\overline {1}}4285{\overline {7}}$

Eksponen	1	2	3	4	5	6	7	8	9	10		11	12	13
$7^{x}\,$	7	49	343	2401	16807	117649	823543	5764801	40353607	282475249		1977326743	13841287201	96889010407
$x^{7}\,$	1	128	2187	16384	78125	279936	823543	2097152	4782969	10000000		19487171	35831808	62748517

Radiks	1	5	10	15	20	25	30	40	50	60	70	80	90	100
Radiks	110	120	130	140	150	200	250	500	1000	10000	100000	1000000
$x_{7}\$	1	5	$13_{7}\$	$21_{7}\$	$26_{7}\$	$34_{7}\$	$48_{7}\$	$55_{7}\$	$101_{7}\$	$114_{7}\$	$130_{7}\$	$143_{7}\$	$156_{7}\$	$202_{7}\$
$x_{7}\$	$215_{7}\$	$231_{7}\$	$244_{7}\$	$260_{7}\$	$303_{7}\$	$404_{7}\$	$505_{7}\$	$1313_{7}\$	$2626_{7}\$	$41104_{7}\$	$564355_{7}\$	$11333311_{7}\$