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.

A056743 a(n) = phi(2^prime(n) - 1)/prime(n); a(0) = 0 by convention.

Table of values

n a(n)
0 0
1 1
2 2
3 6
4 18
5 176
6 630
7 7710
8 27594
9 356960
10 18407808
11 69273666
12 3697909056
13 53630700752
14 204064589160
15 2992477516800
16 169917983040000
17 9770466930024800
18 37800705069076950
19 2202596295934991760

List of values

[0, 1, 2, 6, 18, 176, 630, 7710, 27594, 356960, 18407808, 69273666, 3697909056, 53630700752, 204064589160, 2992477516800, 169917983040000, 9770466930024800, 37800705069076950, 2202596295934991760]

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

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