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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.

A296807 Take a prime, convert it to base 2. Consider it as a string of digits and delete its leftmost and rightmost digit. Leading zeros are kept. Repeat the process. a(n) is the least prime that, in the first n steps of this process, generates a string that is a prime read in base 2.

Table of values

n a(n)
0 2
1 13
2 43
3 151
4 2143
5 2143
6 12479
7 57727
8 246527
9 4267455487
10 276009615632383
11 4469780781584383
12 576406542684520447

List of values

[2, 13, 43, 151, 2143, 2143, 12479, 57727, 246527, 4267455487, 276009615632383, 4469780781584383, 576406542684520447]

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

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