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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.

A262016 a(n) = ( ( Sum_{k=1..n} 2^(prime(k)-1) ) mod n! ) / 2.

Table of values

n a(n)
1 0
2 0
3 2
4 7
5 15
6 83
7 91
8 5163
9 86315
10 401323
11 14725035
12 65973803
13 2562459691
14 37695987243
15 45627576875
16 9183900142123
17 39579412285995
18 2598666482813483
19 28017829467228715
20 223446104928848427
21 275288604322335275
22 116723151945719253547
23 12606804937123633465899

List of values

[0, 0, 2, 7, 15, 83, 91, 5163, 86315, 401323, 14725035, 65973803, 2562459691, 37695987243, 45627576875, 9183900142123, 39579412285995, 2598666482813483, 28017829467228715, 223446104928848427, 275288604322335275, 116723151945719253547, 12606804937123633465899]

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

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