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.

A245284 For any composite number n with more than a single prime factor, take the polynomial defined by the product of the terms (x-pi)^ei, where pi are the prime factors of n with multiplicities ei. Integrate this polynomial from the minimum to the maximum value of pi. This sequence lists the numbers for which the integral is an integer.

Table of values

n a(n)
1 55
2 85
3 91
4 105
5 115
6 133
7 140
8 145
9 187
10 195
11 204
12 205
13 217
14 231
15 235
16 247
17 253
18 259
19 265
20 275
21 285
22 295
23 301
24 319
25 351
26 355
27 357
28 385
29 391
30 403
31 415
32 425
33 427
34 429
35 445
36 451
37 465
38 469
39 476
40 481
41 483
42 493
43 505
44 511
45 517
46 535
47 553
48 555
49 559
50 565
51 575
52 583
53 589

List of values

[55, 85, 91, 105, 115, 133, 140, 145, 187, 195, 204, 205, 217, 231, 235, 247, 253, 259, 265, 275, 285, 295, 301, 319, 351, 355, 357, 385, 391, 403, 415, 425, 427, 429, 445, 451, 465, 469, 476, 481, 483, 493, 505, 511, 517, 535, 553, 555, 559, 565, 575, 583, 589]

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

Content is available under The OEIS End-User License Agreement.