cp's OEIS Frontend

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.

A080360 a(n) is the largest positive integer x such that the number of unitary-prime-divisors of x! equals n. Same as the largest positive integer x such that the number of primes in (x/2,x] equals n.

Table of values

n a(n)
1 10
2 16
3 28
4 40
5 46
6 58
7 66
8 70
9 96
10 100
11 106
12 126
13 148
14 150
15 166
16 178
17 180
18 226
19 228
20 232
21 238
22 240
23 262
24 268
25 280
26 306
27 310
28 346
29 348
30 366
31 372
32 400
33 408
34 418
35 430
36 432
37 438
38 460
39 486
40 490
41 502
42 568
43 570
44 586
45 592
46 598
47 600
48 606
49 640
50 642
51 646
52 652
53 658
54 676

List of values

[10, 16, 28, 40, 46, 58, 66, 70, 96, 100, 106, 126, 148, 150, 166, 178, 180, 226, 228, 232, 238, 240, 262, 268, 280, 306, 310, 346, 348, 366, 372, 400, 408, 418, 430, 432, 438, 460, 486, 490, 502, 568, 570, 586, 592, 598, 600, 606, 640, 642, 646, 652, 658, 676]

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

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