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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.

A238693 Quotients connected with the Banach matchboxes problem: Sum_{i=1..prime(n)-5} 2^(i-1)*binomial(i+1,2)/prime(n) (case 2).

Table of values

n a(n)
3 0
4 1
5 93
6 571
7 16143
8 79333
9 1755225
10 160251339
11 705725473
12 57691858003
13 1057609507815
14 4500326662525
15 80662044522801
16 5995948088798691
17 437230824840308493
18 1820340203482736875
19 130228506669621162901
20 2230237339841166071433
21 9214275012380069727751

List of values

[0, 1, 93, 571, 16143, 79333, 1755225, 160251339, 705725473, 57691858003, 1057609507815, 4500326662525, 80662044522801, 5995948088798691, 437230824840308493, 1820340203482736875, 130228506669621162901, 2230237339841166071433, 9214275012380069727751]

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

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