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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.

A104526 Numerator of sum(1/(phi(k)sigma(k)),k=1..n), where phi(k) is the totient function and sigma(k) is the sum of the divisors function.

Table of values

n a(n)
1 1
2 4
3 35
4 257
5 11
6 271
7 183
8 2773
9 36329
10 109897
11 110443
12 27757
13 55709
14 37291
15 49873
16 1549703
17 13975537
18 14010257
19 2806565
20 2811401
21 5631265
22 9400487
23 103518197
24 103642321
25 103738417
26 311569891
27 311818139
28 312084119
29 312296903
30 312607213

List of values

[1, 4, 35, 257, 11, 271, 183, 2773, 36329, 109897, 110443, 27757, 55709, 37291, 49873, 1549703, 13975537, 14010257, 2806565, 2811401, 5631265, 9400487, 103518197, 103642321, 103738417, 311569891, 311818139, 312084119, 312296903, 312607213]

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

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