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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.

A331862 Numbers n for which R(n) - 10^floor(n/2) is prime, where R(n) = (10^n-1)/9.

Table of values

n	a(n)
1	3
2	26
3	186
4	206
5	258
6	3486
7	12602

List of values

[3, 26, 186, 206, 258, 3486, 12602]

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