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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.

A326392 Lesser of twin primes p for which sigma(p+1)/sigma(p) reaches record value, where sigma(n) is the divisor sum function (A000203).

Table of values

n a(n)
1 3
2 5
3 11
4 29
5 59
6 179
7 239
8 419
9 1319
10 3119
11 3359
12 7559
13 21839
14 35279
15 42839
16 55439
17 110879
18 415799
19 1713599
20 1867319
21 1912679
22 1940399
23 2489759
24 3991679
25 6652799
26 6846839
27 11531519
28 28828799
29 85765679
30 232792559
31 845404559
32 1470268799
33 6285399119
34 6299092799

List of values

[3, 5, 11, 29, 59, 179, 239, 419, 1319, 3119, 3359, 7559, 21839, 35279, 42839, 55439, 110879, 415799, 1713599, 1867319, 1912679, 1940399, 2489759, 3991679, 6652799, 6846839, 11531519, 28828799, 85765679, 232792559, 845404559, 1470268799, 6285399119, 6299092799]

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

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