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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A250474 Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)^3: a(n) = A078898(A030078(n)).

Table of values

n a(n)
1 4
2 5
3 9
4 14
5 28
6 36
7 57
8 67
9 93
10 139
11 154
12 210
13 253
14 272
15 317
16 396
17 473
18 504
19 593
20 658
21 687
22 792
23 866
24 979
25 1141
26 1229
27 1270
28 1356
29 1397
30 1496
31 1849
32 1947
33 2111
34 2159
35 2457
36 2514
37 2695
38 2880
39 3007
40 3204
41 3398
42 3473
43 3828
44 3904
45 4047
46 4121
47 4583
48 5061
49 5228
50 5309
51 5474
52 5743
53 5832
54 6269
55 6543
56 6816
57 7107
58 7197
59 7488
60 7686
61 7784
62 8295
63 9029
64 9248
65 9354
66 9568
67 10351

List of values

[4, 5, 9, 14, 28, 36, 57, 67, 93, 139, 154, 210, 253, 272, 317, 396, 473, 504, 593, 658, 687, 792, 866, 979, 1141, 1229, 1270, 1356, 1397, 1496, 1849, 1947, 2111, 2159, 2457, 2514, 2695, 2880, 3007, 3204, 3398, 3473, 3828, 3904, 4047, 4121, 4583, 5061, 5228, 5309, 5474, 5743, 5832, 6269, 6543, 6816, 7107, 7197, 7488, 7686, 7784, 8295, 9029, 9248, 9354, 9568, 10351]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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