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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.

A180418 a(n) = ( A000111(p) -(-1)^((p-1)/2) )/p, where p = prime(n).

Table of values

n a(n)
2 1
3 3
4 39
5 32163
6 1720635
7 12345020175
8 1530993953307
9 44148864630732711
10 797213247855503373843915
11 281095572810489332134542303
12 26242778669866462496740532647355475

List of values

[1, 3, 39, 32163, 1720635, 12345020175, 1530993953307, 44148864630732711, 797213247855503373843915, 281095572810489332134542303, 26242778669866462496740532647355475]

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

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