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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.

A272061 Primes p such that sigma((p-1)/2) + tau((p-1)/2) is prime.

Table of values

n a(n)
1 3
2 5
3 17
4 257
5 65537
6 453519617
7 1372257937
8 1927561217
9 21320672257
10 76001667857
11 138388464037
12 1216026685697
13 2085136000001
14 8503056000001
15 30118144000001
16 35427446793217
17 37015056000001
18 83037656250001
19 87329473560577
20 97850397828097
21 222330465562501
22 233952748524197

List of values

[3, 5, 17, 257, 65537, 453519617, 1372257937, 1927561217, 21320672257, 76001667857, 138388464037, 1216026685697, 2085136000001, 8503056000001, 30118144000001, 35427446793217, 37015056000001, 83037656250001, 87329473560577, 97850397828097, 222330465562501, 233952748524197]

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

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