The Sum/Product of the First N Counting Numbers

If N = 4, the sum we want is 1 + 2 + 3 + 4 = 10.

If N = 4, the product we want is 1 * 2 * 3 * 4 = 24.

The product of the first N counting numbers is written 'N!'.

N	Sum From 1 to N	Product From 1 to N
2	3	2
3	6	6
4	10	24
5	15	120
6	21	720
7	28	5,040
8	36	40,320
9	45	362,880
10	55
11	66
12	78
13	91
14	105
15	120
16	136
17	153
18	171
19	190
20	210
21	231
22	253
23	276
24	300
25	325
26	351
27	378
28	406
29	435
30	465
31	496
32	528
33	561
34	595
35	630
36	666
37	703
38	741
39	780
40	820
41	861
42	903
43	946
44	990
45	1,035
46	1,081
47	1,128
48	1,176
49	1,225
50	1,275
51	1,326
52	1,378
53	1,431
54	1,485
55	1,540
56	1,596
57	1,653
58	1,711
59	1,770
60	1,830
61	1,891
62	1,953
63	2,016
64	2,080
65	2,145
66	2,211
67	2,278
68	2,346
69	2,415
70	2,485
71	2,556
72	2,628
73	2,701
74	2,775
75	2,850
76	2,926
77	3,003
78	3,081
79	3,160
80	3,240
81	3,321
82	3,403
83	3,486
84	3,570
85	3,655
86	3,741
87	3,828
88	3,916
89	4,005
90	4,095
91	4,186
92	4,278
93	4,371
94	4,465
95	4,560
96	4,656
97	4,753
98	4,851
99	4,950
100	5,050

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