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.

A109628 Numbers k such that the numerator of Sum_{i=1..k} 1/prime(i), in reduced form, is prime.

Table of values

n a(n)
1 2
2 3
3 5
4 6
5 18
6 19
7 22
8 47
9 57
10 58
11 63
12 70
13 73
14 112
15 632
16 1382
17 4621

List of values

[2, 3, 5, 6, 18, 19, 22, 47, 57, 58, 63, 70, 73, 112, 632, 1382, 4621]