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.

A317393 Positive integers that have exactly three representations of the form 1 + p1 * (1 + p2* ... * (1 + p_j)...), where [p1, ..., p_j] is a (possibly empty) list of distinct primes.

Table of values

n a(n)
1 43
2 61
3 91
4 111
5 121
6 124
7 171
8 184
9 187
10 205
11 221
12 231
13 256
14 265
15 267
16 268
17 274
18 277
19 281
20 283
21 291
22 311
23 323
24 326
25 331
26 337
27 371
28 373
29 375
30 379
31 386
32 411
33 412
34 427
35 428
36 435
37 443
38 451
39 456
40 457
41 471
42 474
43 475
44 482
45 491
46 494
47 505
48 507
49 508
50 511
51 519
52 521
53 523

List of values

[43, 61, 91, 111, 121, 124, 171, 184, 187, 205, 221, 231, 256, 265, 267, 268, 274, 277, 281, 283, 291, 311, 323, 326, 331, 337, 371, 373, 375, 379, 386, 411, 412, 427, 428, 435, 443, 451, 456, 457, 471, 474, 475, 482, 491, 494, 505, 507, 508, 511, 519, 521, 523]

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

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