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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.

A334075 a(n) is the denominator of the sum of reciprocals of primes not exceeding n and not dividing binomial(2*n, n).

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 5
6 5
7 35
8 7
9 21
10 105
11 55
12 165
13 429
14 1001
15 1001
16 1001
17 1547
18 221
19 4199
20 323
21 2261
22 24871
23 572033
24 572033
25 408595
26 312455
27 937365
28 17043
29 8671
30 130065
31 4032015
32 1344005
33 227447
34 3866599
35 840565
36 2521695
37 93302715
38 118183439
39 419014011
40 419014011
41 5726524817

List of values

[1, 1, 3, 3, 5, 5, 35, 7, 21, 105, 55, 165, 429, 1001, 1001, 1001, 1547, 221, 4199, 323, 2261, 24871, 572033, 572033, 408595, 312455, 937365, 17043, 8671, 130065, 4032015, 1344005, 227447, 3866599, 840565, 2521695, 93302715, 118183439, 419014011, 419014011, 5726524817]

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

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