A071424 - cp's OEIS frontend

A071424 a(n) = a(n-1) + number of decimal digits of n!. Number of decimal digits of concatenation of first n factorials.

n	a(n)
1	1
2	2
3	3
4	5
5	8
6	11
7	15
8	20
9	26
10	33
11	41
12	50
13	60
14	71
15	84
16	98
17	113
18	129
19	147
20	166
21	186
22	208
23	231
24	255
25	281
26	308
27	337
28	367
29	398
30	431
31	465
32	501
33	538
34	577
35	618
36	660
37	704
38	749
39	796
40	844
41	894
42	946
43	999
44	1054
45	1111
46	1169
47	1229
48	1291
49	1354
50	1419
51	1486
52	1554
53	1624

[1, 2, 3, 5, 8, 11, 15, 20, 26, 33, 41, 50, 60, 71, 84, 98, 113, 129, 147, 166, 186, 208, 231, 255, 281, 308, 337, 367, 398, 431, 465, 501, 538, 577, 618, 660, 704, 749, 796, 844, 894, 946, 999, 1054, 1111, 1169, 1229, 1291, 1354, 1419, 1486, 1554, 1624]

cp's OEIS Frontend

A071424 a(n) = a(n-1) + number of decimal digits of n!. Number of decimal digits of concatenation of first n factorials.

Table of values

List of values